Not true. There are people who are in positions to develop expertise in self defense, albeit each with different emphasis. Bouncers, LEOs, people who are in situations where they are required to defend themselves. In other words, not most of us here.
I'd actually argue with this as well, though. Bouncers, LEO's, security etc are
not concerned with "self defence" when it comes down to it, really, they're concerned with skills applicable to the performance of their job. And while that can and does involve handling resistant and violent people, it's not the same as self defence. The legalities are different, the restrictions on what you can do is different, the end result that is aimed for is different, and the environment (social circumstance) is different. They are not concerned with "defending themselves", they are concerned with doing their job.
I teach self defence (separate to martial arts). I don't teach law enforcement. I don't teach security. I don't teach bouncing. If I was to teach such things, I would not teach it the way I teach self defence, as the simple needs and requirements are different.
A Law Enforcement Officer will be more concerned with arresting, which will lead to an approach involving moving in, not fleeing, taking the suspect to the ground, control, and use of group tactics (where you have other officers there as back-up, rather than just being on your own), amongst other things. There are legal restrictions on what can (or at least, should) be done when arresting a suspect, and strict procedure that needs to be followed.
Self defence is not concerned with "arresting", it's concerned with safety to self, which means that fleeing, or escape, is a dominant tactic, moving in is present, but it is done not to control, but to minimise effective attacks (tactically quite different), taking someone to ground and staying there is ill-advised at best, you often don't have others to help you (in fact, you're far more likely to be outnumbered, whereas the officers are likely to outnumber the suspect), while there are restrictions, it's far more "open", based on the exact situation and perceived threat level at the time, and there is no strict procedure.
A bouncer is concerned with limiting disruption to the venue/location where they are employed. They do not have the option of "avoiding the fight", or leaving the area, they are again often in teams of two or more, usually with other teams available as extra back-up, the concern isn't "arresting", but removal of the disruption. This leads to secure holds without taking someone to the ground so they can be lead out of the establishment. Different locations will have different constrictions on what can be done (no kicking, no fists, open hands only etc), and there will be an application of tactics designed to enter and restrain. Yes, they'll have people kick off, and launch attacks at them, but the response will be a security/bouncer one, not a self defence one.
Self defence will not have you restricted to the location, again giving the option of escape or fleeing the site, again you will typically be solo, and more often outnumbered. You will not be concerned with just taking someone outside as a primary aim, and you won't have the same constriction over what you can or can't do.
Having a job where you deal with violence doesn't mean that you're more geared up for self defence, it means you have a job which involves an aspect of dealing with violence in a certain defined way. But let's see if I can demonstrate how someone can teach, or be taught self defence.
The first thing that needs to be addressed is what the definition of self defence actually refers to, as simply "handling violence" is only a part of it, in the end, and physically handling it is an even smaller part. The common mantra at our schools is that the aim of self defence is three simple words: Get Home Safe.
That's it. Self defence is training geared towards the aim of Get Home Safe.
Now that sounds simple enough, but it means that there needs to be a congruent focus towards this aim in everything done under the title of self defence, as anything that doesn't fit that, or compromises it, takes away from the aim of self defence in the first place. Every drill has to have the aim of "Get Home Safe". Every topic has to have the underlying theme of "Get Home Safe". Every physical skill set has to have the underlying aim of "Get Home Safe". Every training method has to have the application of "Get Home Safe". And believe it or not, that actually rules out a lot of things done in many martial art schools, most especially things like sparring and rolling (in a BJJ sense).
So once this is understood, the self defence instructor needs to understand how to structure things so that this aim is present at all times. That means creating a program around skills that are based on the strategy, and a method of instruction and drilling to ensure that the skills are ingrained in the students. We'll take my teaching as an example.
The skills I teach as part of self defence include:
- De-escalation (verbal, physical, passive, and aggressive)
- Recognition of potential dangerous situations/persons (awareness, common approaches used by street predators etc. This is in conjunction with the De-escalation typically, as De-escalation is practiced against all the common approach methods)
- Pre-emptive striking (recognising pre-fight triggers, creating an opportunity to escape)
- Group defence (primarily Pre-emptive striking taking into account the hierarchy of danger based on the location of each member of the group)
- Knife defence
- Impact weapon defence (such as baseball bats)
- Close quarter brawling (teaching to handle barrage attacks)
- Ground defence (escape from the ground, not keeping someone down)
- Management of range (limiting the attacks of an opponent so you can escape)
- Legal realities (how to talk to the police, what to expect if/when you are arrested, and so on)
- Psychological traits of street predators
- Body language
- Anti-surveilance (not being a "mark")
- Protective driving (as opposed to "defensive driving")
and more.
The way these are typically approached is that there are a series of scripted drills designed to teach the lessons which are trained up to full speed/power, with the attacker guided to be as realistic as possible (which doesn't necessarily mean "resistant", as that isn't actually realistic), and under adrenaline. Once a sufficient number of drills have been put together, the "attacks" (which could be an approach, a threat, or a physical assault) are done randomly, with the student needing to deal with each in turn. This can be taken all the way to completely random attacks at random points, or random "tests" done by senior students or the instructor, with drills such as the "Bogey Man Drill", or simply by instilling in the students a sense of what is or isn't safe, and getting them to keep that mentality at all times.
Self defence training and martial art training are different. They have different aims, different environments, and different requirements. But just because you've only ever had a martial art experience doesn't mean that teaching self defence is impossible. Again, Steve, I'd say that you simply have never experienced it.