He promised to pardon the rioters during the election and it didn't hurt him. I think he decided it wouldn't hurt him (and Trump cares bout that first) and if he thought about the midterms ... maybe won't hurt then either.
Congress isn't directly involved in any of this anyway.
People hate congress. Yet each person can vote to only change one congressman at a time.
https://news.gallup.com/poll/1600/congress-public.aspx
October of 2001 they were up to 80% approval. Left to their own devices by Aug 2002 they were below 50%.
There's an argument to be made that congress doesn't really represent the people at large. Some people go on to make the argument that through gerrymandering politicians choose who's elected, and not the people.
I'd like to see some ranked choice voting.