Predicting Virginia Tech

When are people going to get it through their pointy little heads that we don't know how top predict violence?

The Agitator, one of my favorite bloggers, gets it right with the basic idea that if you think we can call whatever happened before the violence a predictor that's pretty much equivalent to saying you can't predict. The problem being that to many people don't realize that.

Deadmonywalking points out that just because his history of mental illness might explain his behavior doesn't mean that history could have predicted it.