I only mention his girlfriend because I heard an unconfirmed report that said something along the lines of a fight with her. If that turns out to be true, then it will only be his very own ass to blame. When they find concrete evidence that says he went that route with his obvious anger because GTA/Doom/24/whatever made it look cool...THEN i'll accept that this particular incident happened because of video games or violent entertainment.
But that won't happen so....let's call the guy a complete douche and remember his victims. I won't ever show remorse for him no matter what finally comes out because nothing that happened to him can come near to what he did to all those people.