I agree with you that you can’t change the past and you can only change the present - and that’s it’s not terribly constructive to say coulda-shoulda.

But honestly… It takes a particularly dim-witted individual to vote for Trump the first time, and a complete and utter moron to do it again the second time. It’s not like nobody could see any of this shit coming, and anybody with an IQ above room temperature knew this was gonna happen. That’s what’s so damning!