Just my morning miscellaneous thoughts on this shooting...
I'm a little concerned that people are taking all this person's personal quirks and suggesting they're all hints he could be the kind of guy who kills lots of people in a rampage.
KrisX makes a good point about his writing - violent writing doesn't necessarily mean anything.
And the Question Mark Kid? I signed my name "Evil Incarnate" for several years, starting in about 1990. It was a nickname my friends gave me. The college I was at even accepted it - I got talked to one time for signing out a basketball that way, but it was more of "If you took the ball we wouldn't know who to go after" and not "This is seriously creepy."
I don't like that the news is making a big case about the company that sold him the Glock 19 either. That company did everything by the book. It wasn't a case where they snuck him a handgun. They requested all the right documents, got them, sent them in, waited for the federal government to ok him, and only then sold him the gun. But the store owner is being berated...
Also, we had a threatening email go to one of our high schools here in St. Louis today.

That's just not cool.