What are the real reasons behind m shootings such as the current terrible tragedy?

I think society labels the people who do these things as evil, subhuman, ect. I suspect more is going on - the people who do these things are different from the mainstream and have been labelled geeks and losers and so on. They get terribly upset, put their hands on a gun, and express their hatred. Of course they are TOTALLY wrong to do this. But I think that the thinking in society that puts a high premium on good looks, sporting ability, confidence, and style, and labels outsiders 'geeks', 'nerds' and similar humiliating labels has a role and responsibility in helping to generating the pion and anger wich is then, sometimes, so tragically expressed .