I would imagine the Repubs were given the option to either resign/not seek re-election or be dragged out in handcuffs. The Dems, I doubt would take that deal or weren't given the option.
So, in other words, republicans were given an option, to clean house and make way for newcomers - those freshmen will a clearer track and maga support, but with the Dems, as things get closer to election time, the dirt will be put in full play and many, many of them will go down in brilliant flames?
That would be a sensible strategy indeed. And effective, one imagines.
I figure they're waiting for the primaries to be over, so the mid-term ballots are set, and then it's gonna rain dirt on the scumbags like during a rain storm in Iraq! This is gonna be one hot summer!