They’re Not Even Going to Try Huh
The sole acceptable reason for Democrats not to try and impeach Trump is that Republicans in the Senate will never be persuaded to vote in favor, and it is thus doomed. This reason is vastly outweighed by other good reasons, such as that there is a lot of evidence he has done crimes, even beyond the quite clear evidence of obstruction in the Mueller report, and that there are many important things that you should try whether or not you think you have a good chance of succeeding. (Haven’t these guys ever watched a Hollywood movie?)
If we had a functioning political system, “a party that is fully dedicated to protecting its leader and also insulated from the public’s actual views by gerrymandering and voter suppression” would not be the roadblock that it is now, and Democrats would be able to pursue what is objectively and legally the correct thing to do.