Until enough people do, and sufficient votes are taken from the purple party, that they lose.

Nope, you utterly miss the point. First past the post means that Republicans win when the anti-fascist vote is split.

If you don't like the current candidates of the Democrat party, then go vote in the Democrat primary.

Imagine if the people in USA got a system that helped them vote for what they want, not against who they don’t want. Imagine… :)

There is this little thing called "objective reality". First past the post sucks, but it is objective reality. You should try taking it into account, some time.