Here is the problem: I don't think the Democrats impeached Trump because it was the "right thing" or because they put principles and country over party and personal ambition; they did it because they hate Trump and couldn't wait to "get" him.
And I can't say I blame them. Trump is a clown, I am sure he is guilty of everything he is accused of and then some, and he has made it really easy for Democrats and anyone who doesn't march in step with everything he says and does to dislike/hate him, but let's not act like the Democrats were the moral police here and did this because they cared about principles or doing the right thing. The end result, Trump's impeachment, does not mean we have to like the road they took to get there, even if that end result was the right one.