The issue is that most people in despair are inclined to vote for a massive change. They just want anything different than the current status quo.
At the moment in the USA, only the right is offering substantial, systematic change. As awful as it sounds to centrists and the left (I.e. the majority of the population), they don't offer any substantial alternative.
We're basically at a point where the current status quo/political center WILL be replaced by something else. Centrists need to realise that the only alternative to right wing change is left wing change...