Come To An Agreement And Put It All Behind Us

This has a been a pernicous idea in politics my whole life. It comes up in a lot of contexts, especially various imagined Grand Bargains. There is for some reason a desire to come to a final agreement and take the politics out of politics forever. Why can't both sides just agree to a compromise?

Abortion is a big one. You know, The Left agrees to "commonsense restrictions" and The Right agrees to "stop murdering abortion doctors" and then we can all get back to the cocktail party, having left that unpleasantness behind us.

The importance of specific issues can wax and wane for various reasons, but it's rare that any compromise can just solve the problem forever. Nor should we want that, generally?