First, they can acknowledge that they are being sucked down a nihilistic whirlpool. Second, they can acknowledge the long-term damage being done to the country and to themselves.
Amid the chaos, all sorts of ugliness is surfacing. See the video of the horrific things shouted at Trump rallies compiled by Times reporters. Moreover, Trump is permanently tainting the names of conservatism and the Republican Party and the many good men and women who have built and served it. As Ben Shapiro writes in National Review, “Trump asks something more — your political soul.”
Events are going to force Republicans off the fence. For the past many months Republican leaders have been condemning Trump’s acts while sticking with Trump the man. Trump is making that position ridiculous and shameful. You either stand with a man whose very essence is an insult to basic decency, or you don’t.
Those who don’t will have to start building a Republican Party in Exile.