You really don't need to be an expert to note the connection between the individuals doing these crimes and the fact that they're all mentally unstable.
I was referring to the clip ban comment and making a blanket statement about mentality instability is neither here nor there anyway. Bullying, parental issues, abuse, etc have all been factors in the past. It's not as simple as "fix mental health duh!!!". That's the whole problem with this sort of debate, people think there are simple solutions to complex problems and that's rarely the case when it involves a society of people.