All thought and prayers to the recent families and their victims.
I think the media has a lot to do with it. They focus on and preach doom and gloom. They focus on bad stuff stories, the economy in the tank, violence, including the recent shootings. A lot of the internet isn't any better. The perp probably thought he was at the end of his rope and with the spotlight on shootings in the media he did the copycat thing, made his statement, and got his moment of fame.
Of course the antis and the biased media will never let a tradgedy go wasted and will exploit the latest incidents to spotlight their agenda.