It didn't. Conservatives in this country have explicitly been headed this direction since they decided to never let another Nixon happen. Not that they would prevent another criminal Republican. But they would ensure that Republicans are never punished for behavior like this. It led to Fox News and Gingrich and Rush Limbaugh and Tucker Carlson, etc. The writing has been on the wall in plain sight for everyone to see for literally decades. The people who have been pointing it out and stating this is exactly where the country has been headed are called radicals and casually dismissed. The only reason Romney lost is because he didn't lean into the hatred his base was demanding[1]. Trump delivered what they wanted.
https://www.theatlantic.com/politics/archive/2012/07/romney-...