Let's be honest with ourselves: the American right has a deep-seated problem with political violence. It's deep-seated; it's recurrent and it's real. And it endangers the country. It just makes sense to say something the first time they hit the sauce and not wait for things to get really out of hand.
The problem is, of course, that 99.99 percent of right-wingers are peaceful people. And so talking about this real issue is very, very difficult. Statements of fact turn out to be legitimately offensive to folks on the right who would never, ever participate in or advocate for political violence.
It's key, then, when talking about this to acknowledge that we are talking about crazy people, and that, while we may disagree with the political tenets of the right, they are not crazy.