This is surely part of it, but I think there's even more than that. How many times have we seen Republicans respond to a Trump atrocity with condemnation in the early aftermath, only to quickly shift gears and pledge their support instead? They already hated the same people going into their initial criticism before abandoning that, which itself tacitly admitting they were wrong.
I think they might be getting drastic threats coupled with big payoffs, the latter of which ensures they are in on the crime, so they can't flip or they'll experience the former, which doesn't necessarily have to be a mortal threat, maybe more of a criminal prosecutorial threat, the threat of prison, meaning not country club jail.
Threats + payoffs = mobster ****.