Most people have no immediate need for such skills. They generally have developed habits and lifestyles that minimize their exposure to potential threats. They are aware that such threat exist, but rather than train to physically fight such threats, they place their effort into things that affect them on a more regular basis.
I will say again that in the times we live in, any place can be the wrong place and anytime can be the wrong time. Self-defense, as I define it begins long before having to go hands-on. It would always be a good idea to take a course on ways to prevent crime such as home security, while traveling etc. Many local police departments offer this service as a community project. And I will maintain that a good, solid course that offers some basic, gross motor skill principles are a plus and not a negative. I often offered very short duration courses, usually for women at my school. I would stress the prevention side, offer some very basic H2H principles, teach about O.C. and give each student a key chain spray and/or personal alarm for the key chain.
For the most part, if an adult follows all of the advice their mother gave them when they were little, they will probably never need to defend themselves against an unarmed attacker. Against an armed assailant, such as a mugger, most people simply give them their wallet and leave unscathed.
They also used to tell women to submit to the rape and not resist because they wouldn't get hurt if they didn't resist. It doesn't work that way in real life. They still tell people to cooperate with the mugger and not resist so they don't get hurt. It does't work that way in real life. Oh, you might occassionally get the 'gentleman' rapist or mugger that won't hurt you I suppose. And 'official' agencies can't really tell you otherwise becuase they don't want to be responsible. But the fact of the matter is that you are far more likely to get hurt regardless of whether or not you resist and the major factor is drug related.
Listen to me clearly people, I'm very serious about this because I know first-hand because I talk to these people almost daily. Many are NOT in their right mind. If any of you knew just how many 'bad people' are on serious medication you would be dumb-founded! There are normal street drugs, prescription abuse, homemade drugs and now the synthetic drugs sweeping the streets. When these people are high (and they most often are on something during the commission of the crime) they will NOT act like human beings. When you watch the evening news or read the daily paper you are only seeing a fraction of crimes. Most don't make the paper.
Now, I'm not suggesting you walk around like a Ninja, suspecting an attack around every corner. Nor am I suggesting you freak out if someone asks you for the time. What I'm telling you is that violent crime can happen anywhere, anytime, to anyone. And if you've been selected as the potential victim you're going to have to make a choice at some point in the incident. As I've stated before, the mission is survival and the method is whatever it takes to accomplish the mission. The 'method' may be to simply hand over your wallet and the bad guy takes it and runs away. But you better face reality in that you may very well have to fight for your very life. In todays age, which would you think is more likely?
Everyone likes to think it will only happen to 'someone else'. Well....someone has to be that 'someone else'. Situational awareness goes a loooooonnnnngggg way. De-escalation goes a loooonnnnnggg way. Swallowing your pride and walking away when someone has called you a %#$*&(^ goes a looonnnnngggg way.
But you know what?
When that fails, a good solid chin jab, eye rake, throat punch or knee to the groin can go a looooonnnngggg way as well. And it doesn't take a whole lot of training or practice. And with respect, I'll maintain that these easily learned gross motor skills will retain their usefulness for a very long time. Does it beat training on a regular basis? No. Does it beat just standing there and being a victim if all other options have been taken away from you to walk away unharmed? Yes.
But...but the person might get hurt if they try to fight back..
Well, if the person is going to hurt you regardless of what you do then at least give yourself a chance. But ultimately it is up to you.