I think Romney himself could make a decision that stupid. I thought he made noises about supporting the impeachment investigation or at least asking supporting questions. Nothing came of it so I assumed someone shut him up.
The Republicans may not like Trump voters (just like Tea Party voters), but they realize they need them.
The Tea Party was a result of massive dissatisfaction with Washington, including the Republicans.
So the ruling parties (Democrats and Republicans) did everything they could to kill it.
Donald Trump is the result of that.
I think some of them (mostly on the Republican side) realize that if they try to "Tea Party" Trump, the next iteration will be worse. And might involve bloodshed, or AT LEAST prison.