Ryan is in a very competitive distrinct (+3% Republican), so it wouldn’t take a lot in the general election to unseat him, depending on who his Dem opponent is.
If you can’t stomach voting for a Democrat, just leave that race as a “No Vote”, which would be a 1 vote difference in the counts, versus voting for the Dem which would be a 2 vote difference in the counts.
He needs to go whatever it takes to make it happen. Same for my (R) congresswomen - Mimi Walters.
And dat's the name of dat tune.