For me, it's not the voting. Do I think a principled conservative should vote for Trump? No, of course not. Can I understand that a pragmatic conservative would vote for Trump? Sure.
So go ahead and vote, but do so while acknowledging that he's a reprehensible person that brings out the worst in everyone and whose conduct is utterly deplorable. Don't follow Trump into an imagined reality with alternative facts, don't defend the absurdities, don't be the audience for his nastiness, realize he's rotted the GOP to the core.
It's a really low bar, yet millions and millions can't reach it.