This has been a long time coming, and most of the decent ones chose to resign rather than split the party. I remember for instance years ago when the far right really started winning elections in Idaho, a lot of the lifelong conservatives chose to resign in quiet protest rather than fight them or try and work with them.

It’s basicly the same thing you’re seeing in the federal government now, a lot of the people would rather resign than deal with him, and as such he gets to fill the roles with his loyalists without a fight.