I disagree. Lets take a look at other mass shooting from unstable people; Columbine, Virginia Tech, Fort Hood (although this is being called a terrorist attack), office shootings (pick one). These people are clearly deranged and just about anything will set them off. As soon as we start blaming political rhetoric something else will take it's place. As horrible as it is, these things do occur, the best thing we can all do is learn to protect ourselves from them.
IDPA ftw!