Absolute bullshit really. If a black guy had gone in there and shot that many people I'm sure he'd be called more than a thug! And, if you're being honest with yourself Didactic, I'm sure you'd know deep down that they'd have a look at his state of mind as well. Oh, and if an Arab bloke did do it and said it was for political/ideological reasons then he would quite rightly be called a terrorist. Come on, you know all this anyway - this is definitely something you've got wrong.
On another note, has a black guy ever done anything like this, for some reason all I seem to remember are white guys doing it.