I mean I literally watched Trump build a coalition inside the GOP based on the idea that the neocons are why your kids came back from Iraq with PTSD and your neighbor is a Muslim, the rest of the Republican party wasn't fascist enough, and they forced a loser like Mitt Romney on the base who then lost to "the Black guy" into a full party takeover.
It is not even remotely hard for me to imagine 600,000 Trump-slurping nazis didn't fill out their entire ballot. These are not sophisticated people.