One can argue the role of PTSD in the terrible events at Fort Hood. I don’t think it’s a relevant issue. The man murdered people for no reason.
But one can point out the ready availability, in our society, of weapons of mass destruction to the deranged and angry. What’s up with a society that has 200 million (million) weapons in circulation? Many of these guns are not appropriate for personal protection or hunting, but simply very efficient tools to kill people, as demonstrated in Fort Hood. Is this where our “freedom” leads?