I can't offer a psychological explanation, but my impression from the people I know who are the most eager to offer their opinion on the shooter is that they lo

I can't offer a psychological explanation, but my impression from the people I know who are the most eager to offer their opinion on the shooter is that they love it, that this is the coolest thing that happened to them this month. They'd be bored without it (or they'd be stirring up drama with their friends or co-workers.) They say they're angry, but they seem more excited and gleeful. Some people love tracking hurricanes, some people love elections, and some people love tragedies. It's a break from their boring lives, a dramatic and important occasion to share some excitement with millions of other people. Like when Princess Diana died -- suddenly a lot of people realized that she was really, really, really important to them. (Not that she wasn't important to a lot of people, but there were also plenty of people who were determined not to get left out of the excitement even though they only had a vague idea who she was.) With Princess Diana it was grief, and with Ryan/Adam Lanza it's righteous anger. People are just enjoying the hell out of it.