About 35 years ago**, as part of a "General Studies" course we spent some sessions talking about "Violence in Society". I can't really remember many of the details, but I do remember there was a small correlation between poor education and violent behaviour, but you'd be hard put to it to make that "cause and effect". There WAS a far greater connection between poverty and violent behaviour, I recall.
** I was a very precocious 5 year old, or something.....