Donald Trump said some more disgusting things over the weekend. If this surprises you, you haven’t been paying attention. Also, don’t be surprised if a majority of Republicans approve of his attack on the parents of a dead war hero. After all, a YouGov survey found that 61 percent of Republicans support his call for Russian hacking of Hillary Clinton.

But this isn’t a column about Mr. Trump and the people who are O.K. with anything he says or does. It is, instead, about Republicans — probably a minority within the party, but a substantial one — who aren’t like that. These are people who aren’t racists, respect patriots even if they’re Muslim, believe that America should honor its international commitments, and in general sound like normal members of a normal political party.

Yet the great majority of these not-crazy Republicans are still supporting Mr. Trump for president. And we have a right to ask why.

True, a Clinton victory would mean a continuation of the center-left governance we’ve had under Barack Obama, which would be a big disappointment for those who want a turn to the right. And many people have convinced themselves that ideology aside, Mrs. Clinton would be a bad president. Obviously I disagree on the ideology, and while we won’t know about a Clinton presidency until or unless it happens, I find much to admire in the real Hillary, who is nothing like the caricature. But never mind: even if you’re a conservative who really dislikes the Democratic candidate, how can you justify choosing Donald Trump?