I always tell people that if they want to learn self defense, join a running club and learn to sprint. Don't mind krav maga or any of those other bullshit courses on self defense.
I realise it's already been discounted from this discussion, but as you mention it.
Krav Maga was designed specifically to give someone a quick beating before they can scream for help, then you can run away.
The Jews didn't have much time to get the job done in 1940 so escape was always the goal.