But just assuming that every Trump voter is a White Supremacist is no good.
If 46% of the country were _actuality_ White Supremacists, they would have a commanding plurality in Congress. Everyone would have to suck up to them. They would be way better at pushing their agenda.
And that's the nature of representative democracy. You have to compromise with anyone who has a decent amount of voters, and 46% is way above decent.
If this was a parliamentary system, the Trumpist party could form a government by joining with almost any minor party.