What do you suggest they persecute facebook for? Making their app too fun for school?
There are plenty of other examples, such as default features they can put into place to protect children from harassment that they simply do not do.
Why is that the only people responsible for their children in any way at all whatsoever are never held accountable?? It is always, 100%, in every and all cases, the parent's fault. Either they're too stupid to know better, or they simply don't care.