We have another kook going postal and killing a bunch of people. Nothing to see here because, well, this will happen again. No matter how much gun control or liberalization you have, the nutcase is unstoppable as long as there are such weapons available. It happened in Norway, with far more stringent gun control, and it happened here.
Yes, you can reduce the probability a little bit with regulation, education, preventive treatment for the mentally ill and such, but not enough. There are far too many guns already out there.