They should be held accountable.

I would like everyone to be held accountable. How does letting Trump win help the country? Is he going to hold them accountable for anything you've listed?

This sweeping under the rug because of "blue no matter who" mentality shares more similarity with right wing extremities than with normal people.

Keeping openly fascist tyrants out of power isn't sweeping it under the rug.

You act like preventing neoliberal dems from winning an election will "teach them a lesson" or "hold them accountable". It won't. Every time a Republican wins an election it pushes democrats further to the right in an attempt to be the reasonable centrists. Look at the last several decades and tell me that isn't what happened. Corporate Democrats don't get more brave and try to capture the leftist's vote, they cower and try to claw more independents as the Republicans push more to the right.

The answer isn't to not vote or vote third party. The answer is to get involved and fucking make them more left. Be the third party and start local, protest, make your voice heard.