In the case of this conversation; If you can provide objective evidence of a RBSD guy beating a bunch of armed attackers with his bare hands ala Steven Segal, I'll be a believer.
In fairness, properly done RBSD scenario training is
not about beating a bunch of armed attackers with your bare hands a la Steven Seagal. It's not necessarily even primarily about fighting. It's about situational awareness and control.
Beating a bunch of armed attackers with your bare hands is not a high-percentage proposition for anyone. It doesn't matter whether you're a cop, soldier, bouncer, pro fighter, or martial arts instructor - unless you're in a movie with the scriptwriter on your side it's not likely to happen.
One purpose of (properly constructed) scenario training is to expand your options beyond squaring up and beating the other guy(s) in a fair fight. In rough chronological order, those options might look something like this:
1) Perceive the potential for a violent encounter before it starts.
2) Avoid the situation
3) Manipulate the situation so that if violence does begin, the attacker(s) don't have the odds stacked in his(their) favor at the outset with surprise, superior positioning, numbers, weaponry, etc.
4) Manipulate the situation so that if violence does begin,
you have the odds stacked in
your favor at the outset with surprise, superior positioning, numbers, weaponry, etc.
5) Verbally diffuse the situation (this will be a whole lot easier if you have managed 3 & 4 above - most predators will avoid a confrontation where the odds aren't stacked in their favor).
6) If steps 1-5 have failed, work to survive, disengage and escape.
7) If steps 1-6 have failed, work to survive and exercise some option that will improve your odds - find/deploy a weapon, use the environment to make yourself harder to attack, etc.
8) In the aftermath of the incident, be prepared to deal with local law enforcement in a way that won't get you into further trouble.
There's more of course, but that gives a general idea. You'll notice that most of it isn't about fighting and such fighting as there is isn't about "beating" the other guy(s). (This is from a civilian self-defense standpoint. LEO scenarios may include a need to subdue opponents/suspects, but they get advantages of weaponry, numbers, legal backing, etc that a civilian may not.)
I do disagree with Kong Soo Do's contention that sparring and/or sports training will necessarily work against developing the skills I've mentioned above. They
can be counterproductive, but not necessarily. It depends on the mindset you train with and how you supplement that training.