[fulladder]

I don't have any statistical data on this, but my impression is that it's more than "some people." It may be half or even most.

You have one contingent that is anti-Trump and will vote for any alternative to Trump, even a senile old man with dementia. You have another contingent that is against Progressivism/leftism and will vote for anything that opposes this, up to and including voting for Trump despite strongly disliking him.

The root problem is that social media amplifies extreme voices, so you get very extreme rhetoric coming out of both sides. This scares people and makes them feel like their primary goal must be to vote against the scary thing.

[kulahan]

I think you can lend credence to this theory in your first sentence by considering election strategy. Usually the focus is on the moderates, because those super motivated voters are pretty easy to guarantee.

The moderates end up being a very small portion of voters, I believe?