Society is failing those that do their best to bring the next generation up to speed.
This is the direct result of wishy washy right-on liberalism. The chattering classes in their Islington coffee shops have a lot to answer for as does Blair with is HRA.
This sort of attack is relatively rare these days, though. The last case anyone remembers is in the mid 90's. I don't see how you can link such an isolated incident to liberalism. Tragic case, not too far away from my old home. But a product of liberalism? Hardly. If this were the tenth such attack in the last year, down slightly after a peak during the 2000s, you would have a case. But it's not so you don't.
I think a lot if people would be shocked by how 'rough' even some 'good' schools are. For the last two or three years of my job in teaching I was increasingly aware of how threatening some of the students were - I was shoved (when pregnant), verbally absurd, spat at, followed home by car by an older student, had to rescue a female student from her knife wielding (non-student) boyfriend, etc, etc.