Basically, a lot of it has to do with drug abuse and associated damage with it. If people have poor role models affected by drugs the cycle continues downward sadly. If people have poor role models affected by drugs the cycle continues downward sadly because they in turn are genetically affected. And so it goes.
Until the governments of the day REALLY do something about drugs in this country, associated things like domestic violence, gang violence, school and online bullying will continue. Japan's stance on drug abuse is very clear and their DV record isn't as high. Ditto Singapore.
This is not a one answer fits all questions solution. I agree with the OP's sentiment but I feel from the bottom of heart and arse, it's a major contributor. Positive role models and drug abuse.