The Recent Church Shooting

I heard about this, and it's a very sad story. You might be surprised to hear me say that because I'm an atheist, and you probably imagine me saying how, yet, another religious person has killed. However, from reading the news reports (however uninformative the media might be, it's all I have to go on) it seems that the guy was kicked out of the church and wanted revenge. I don't think it had to