Sarah Palin did not cause this. Nor did Rush Limbaugh, Glenn Boeck, Keith Olbermann, or Rachel Maddow. Fox News and MSNBC are not to blame. Nor is Ann Coulter. Vicki McKenna and Sly are not to blame.
That said, all the aforementioned, and the whole lot of political talkers, tweeters, and bloggers need to have a few big helpings of STFU for starters, and then carefully consider the content of their public communications.
The young man who did this is probably insane.
Don't "try to make sense of this", as the popular have attempted since Saturday afternoon. It's not about "sense."
It's a tragedy.
Thoughts and prayers for the families of the victims.