Also, I don't think most people calling for impeachment are naive enough to think that it will lead to removal, so let's just drop that disingenuous aspect of the debate altogether. I am saying that it's 1) the constitutional duty of congress to provide oversight 2) it's a symbolic gesture that let's constituents know that at least one party is doing its job, part of which is to provide checks and balances to the executive branch 3) it lets the D base know that their reps haven't given up and rolled over 4) it is bad PR for Trump. Any time he's been involved in a long, drawn out scandal his numbers have gone down. It's just that he has an insane, rabid base that will stick by their man no matter what, but those aren't the people you're trying to sway.