With at least three violent shootings in the past four days — school shootings in both Tennessee and Louisiana, and the City Hall shooting in Missouri — lots of you have been commenting on this sad trend. I'm curious: Do you think increased instances of reports of violence are spurring copycat crimes? Or is the crime rate the same and we're just more attuned to tragedies, making it appear like a trend? Does it make you feel differently about gun-control laws? What do you think is behind the violence?