The harm is what it is doing to the reputation of the process whereby we elect people to represent us in government. It is an attack on one of the foundations of our country. That's why.
Would you mind if someone attempted to sue you continuously for some alleged vice which you don't have, but want a judge to allow them to go into your personal life and depose you and your friends, business associates and acquaintances with no proof that you have such vice or have demonstrated a defect of character associated therewith? Of course not.
Why would we then allow someone to undertake an effort to pull down our country to satisfy an inflated ego? That's where you lose me.
Trump lost. Republicans are afraid to admit it because they fear his wrath. The rest of the world isn't afraid of him.
He lost. Jan 20, if he doesn't leave the White House, he'll be frogmarched out by the Secret Service. Trust me on that one.
There is a world of difference between impugning the reputation of a single person vs. one of the foundations of the country. I think there has been enough smoke to at least allow the investigation of a fire to occur. What I don't understand is just saying, "Nope, nothing to see here. We're not even going to look". These allegations haven't been made up out of whole cloth like the whole Russian collusion thing was, yet we allowed that to tie up the entire legislative branch for 3+ years. I think a few courts could spare the time out of their schedule to allow a trial. Like I said, if it's shot down in the court after a trial, then so be it. But to just dismiss it out of hand is not acceptable. It's too important.
There seems to be a LOT of resistance to allowing subpoenas, etc. to even be entertained, don't you think? Why do you suppose that is? If there is nothing to hide, then it would go a long way with the court of public opinion to be as open and transparent about everything as possible. Why the rush to delete evidence (in the case of MI)? What don't they want to be discovered? Those with nothing to hide, hide nothing.