So then...WTH is your point?
Veto the legislation and get thrown out of office on your ass??
Why?
Why?? Are you serious? You veto left-wing to stop it from becoming law. That's what a conservative President is
supposed to do when facing a Democrat Congress. Then again, Trump is a populist and not a conservative, so expecting him to veto leftist bills is probably expecting too much. His own image is all that matters to him.
Oh, and what did
not stopping the Democrats' legislation get him? He lost the election anyway.
So that you can chisel the words "At least he stood on his principles..." on his gravesite? 
Classic. You examine what Trump should do by how it impacts what is written on his gravestone, not by its impact on the country. The perfect distillation of Trumpism.
Meanwhile The Left invariably advances
You'd expect the left to advance when there is a Democrat in the White House. What is much worse is when the Republican in the White House refuses to stop them because he's more worried about his own political future and legacy than he is about doing the right thing.