Sure. You will likely lose, but you can sue 'em. Even if you win, you won't get anything but the pictures on the wall.
Martial arts teach how to fight in a specific discipline. They do not teach street fighting. You picked the wrong school for that.
Oh, and you forgot to get a warranty. Bob, I like bananas too.
I am a little bit outraged as to what you guys are suggesting from all this particularly the one who is implying that all the students should be removed from this school. Firstly im sorry to hear about your son. What has happened to your son was not the schools fault, they have equipped him with methods of combat which are effective for self defence but not all scenarios will guarantee that the outcome will always be in his favour.
I would like to also point out that having a black belt DOESN'T make you invincible, and in the situation where your son was attacked has for more reasons as to why he lost the fight none of which should be the schools fault. I have been in the same situation as your son I was attacked recently, and lost. I am also a black belt.
What caused my loss was my inexperience to the environment outside my club, when your training ina club there is a completely different environment which does not effect the body the same way it would be when exposed to an attack.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.