Why shouldn't Democrats govern on an open campaign of partisan vengeance?

Set aside suggestions that revenge is not institutionally possible, that there is no analogous way to "punish" red states or analogous Republican priorities to destroy. Assume a Democrat can find a way to play a reverse Uno card on Trump: undo everything he's done, give progressives every leftist fever dream by fiat, impound money to fund the gayest basket weaving projects NGOs can come up with, etc. All via executive action, and all done so fast that by the time the courts catch up the damage is already done.

Why *shouldn't* he do it?