Unless and until the schools and parents are willing to reinstate corporal punishment (which means the Social Workers would have to be neutered) and enforce their rules from kindergarten on, they are going to have problems.
There's no downside to this crap, everything in media is fomenting hatred where there was none, in the minds of the students, justifying anything they do, and the perps know they will get away with it.
How in the Hell are you going to teach kids anything but jungle rules in that environment?
The schools and imho especially all the social workers (with a boost from media) have created this problem, and they can fix it by getting 'old school'--but that would require growing a set, and a community to back them up.