Back in my day as a secondary school student, we were broken down into sections on the basis of academic ability as expressed in a combination of grades and scores on standardized tests. The best and the brightest were in the class designated n-1 (with n being the grade number) and the numbers after the hyphen went up as academic ability went down. The kids with a predilection toward violent behaviour were often in the class with the highest second number, and it is no accident that they were generally taught by some of the toughest, often male teachers, that no one wanted to go rounds with.
This sort of crap did rarely happen, especially during the race riots, but overall was just not part of the picture.
But then, there was still a chance someone would go to the gas chamber or 'ol' sparky' if they killed someone, and promptly, without being able to plea their way back onto the streets in ten years or less.
We were a different culture, then, one actually repelled by unnecessary violence, instead of saturated with images of mayhem and murder and hate.
Thanks for nothing, Hollywood.