You're taking a few most extreme examples to try to generalize the whole party in a way that you wouldn't accept as fair if it was reversed. More democrats were against impeachment up until Trump's call to Zelensky to investigate the Biden's while withholding foreign aid. That abuse of office by Trump is when a vast majority of elected democrats supported impeachment. Even ones that are definitely at risk of losing their seats voted for it. I think republicans are going to pay the price in the long run though. They have to defend that "perfect" call and their own actions in not asking Trump to provide witnesses and documents that everyone knows wouldn't have helped Trump.
