This was an isolated incident in one small town. The world isn't suddenly less safe because of it, so if you want to go to the theater, please do so knowing you'll more than likely have a good time, assuming the movie isn't terrible, that is.
Exactly. It's a tragic anomaly, that's all. The world isn't less safe. There will always be the violently insane, earthquakes, fires etc. But there's a greater chance of dying via car accident. That's not to diminish this tragedy of course