Progressive here. I vote in every primary and try to rally support for the most progressive in my coalition. Come November, I vote against fascists which means voting for Democrats because they’re obviously better in every way.

This.

Not voting or voting for a third party hands a win to people you don’t want winning. The system is not fair, at all – but that doesn’t mean we should operate in a way we know will lead to a bad outcome. We have plenty of evidence that third parties in the US don’t really make a dent, but they do sway elections (and generally not how you want). The rest is idealism.

It’s also a good example of why single-issue voting means you’ll almost always get more collateral damage, even if you get representation you want on that specific issue.

It is really sad you think you are right
You should try arguments next time
I am not prepared for the mental gymnastics necessary to explain participating in the US election system.

I am not prepared

Don’t worry. We know.