Some of my fellow Republicans have declared they will never, under any circumstances, vote for Donald Trump. They are pessimistic about the party’s chances in November and seem more motivated by long-term considerations. They think devotion to the “anybody but Trump” movement is a principled and courageous stance that will help preserve a remnant of the conservative movement and its credibility, which can then serve as a foundation for renewal.

I sympathize with this perspective, but I am planning to vote for Donald Trump....