Another problem with training martial arts is “beginner’s syndrome.” You learn some, your instructor says how great you are. Then, you get held up on the street, the guy pulls a knife and you react. But, lo and behold, you get cut anyway. Or worse yet, the guy has a gun. Been there. Did not do that. You NEVER argue with a gun.
Same with old-fashioned personal assault. Is the guy bigger? Faster? Multiple? Are you that good? If you’re not, you can get really mashed.
Don’t get me wrong. I’m all for learning basic self-defense. In fact, I think it ought to be required, along with a genuine phys ed course. BUT it can get you in a lot of trouble if you’re overconfident. Better to back off, and run if you can. Only fight if you absolutely have to.