I didn't rage because it's refreshing to see a true villain acting his part for once. Usually killers do the deed and then just suicide or sit silently in court/jail for the rest of their lives. If you're going to forfeit the rest of your free life to do a shooting, why throw away your chances at follow-up psychological attacks? If you've murdered multiple people, your behavior in court isn't going to save you.
In that article one of the parents calls him a coward. There are many, many epithets that would properly apply to this dude, but coward ain't one of them.