Um, this is not a strong position :) not in the case of people who are pretty vocal, just as vocal as the other side indeed, but pretty vocal in their opinion spreading. Just a simple Youtube suggestion list would illuminate you.
Trump + Breitbart and no one bats an eye. It kinda gives you a peek into what the Trump voters think. Not to mention, that is an opinion piece, not a scientific treaty on the psychology of Ttump voting base.
Really, this part weakens the overall idea :)
You do it too just lower on the page:
I think liberal views changed because they were rewarded for changing their views.
How do you know? You don’t it’s another opinion piece.