I don't really blame Billy or anyone from that generation for believing the fine people hoax. They rely on the reliable media for their news and those outlets have done nothing but perpetuate that hoax and others over the years. If that's all I was shown regarding the incident I'd believe that Trump sympathized with those groups too.
The real problem comes with people, like Quack, who are shown the actual words that Trump said and yet still refuse to believe it and go with " Sure, he may have actually condemned neo nazis and white nationalists, BUT I KNOW WHAT HE REALLY THINKS....."
That level of green sky dwelling is someone who is forever lost with zero hope of recovery.