Anyone openly denying the "alt right" and Breitbart having a part of stoking that fire is naive. Do a fucking Twitter search and you can find a lot of awful shit posted by them every hour on the hour.
Here's a snippet of how they attacked one of trumps opponents who happens to be a conservative:
"I saw images of my daughter’s face in gas chambers, with a smiling Trump in a Nazi uniform preparing to press a button and kill her. I saw her face photo-shopped into images of slaves. She was called a “niglet” and a “dindu.” The alt-right unleashed on my wife, Nancy, claiming that she had slept with black men while I was deployed to Iraq, and that I loved to watch while she had sex with “black bucks.” People sent her pornographic images of black men having sex with white women, with someone photoshopped to look like me, watching.
When we both publicized some of the racist attacks — I in National Review and Nancy in the Washington Post — things took a far more ominous turn. Late the next evening — while Nancy was, fortunately, offline attending a veterans’ charity event in D.C. — the darker quarters of the alt-right found her Patheos blog. Several different accounts began posting images and GIFs of extreme violence in her comments section."
http://www.nationalreview.com/artic...alt-right-internet-abuse-never-trump-movement