While I think there are some that can't be reasoned with or convinced, there are some who are simply blinded by their news sources. I can't find the video right now, but after Justin Amash's town hall, a woman being interviewed said that was the first that she'd heard of Trump having done anything wrong. She said she'd only been watching conservative news outlets. My impression was that she was shocked by what Amash had revealed and was going to look into it more. So there's still some out there that can listen to reason but are simply in the conservative echo chamber.