Of course it's broken Britain and ne'er will be the same again because nowadays anyone can see violence and mutilation and worse on video on the internet, video games and the like!
Yes ummmm we did have violence years ago, I was brought up in a pub many yrs ago....but as Danny said it wasn't gratuitous violence it was often retaliation, a fist fight etc. Rarely if ever knives, guns, and people inflicting horrendous injuries. You think you have it covered. I am much older than you....today is MUCH worse than yesteryear!
So for punishment ha ha ha....there isn't any today. IMO anyone doing such things should be shot, they are rabid no good gutter filth...no use to anyone and should be put out of the human race. SOZ guys....my opinion and I know many people who feel the same!