They've got a long track record. If you recall Pat Buchanan's brief (and unexplained) flirtation with Holocaust denial (1990), the already debunked idea that you can't kill Jews (ironically a technique developed on Russian POWs) with diesal fumes. That was published in Carto's Spotlight.
The Republican Party just doesn't need to be associated with this stupidity.
Got it. Your theory is that anyone who opposes preemptive and undeclared Wilsonian wars is a really deep down a Nazi, anti-semite, Communist, wife beater, and, of course, hangs Rosie posters all over his walls.