Many Republicans do. A plurality, it seems. But a significant minority are, apparently, also willing to subordinate that to the need to defend whatever the candidate does.
But you are right - you don't have to agree with Mr. Kahn to avoid getting into a fight with him. Trump never had to agree with or even pretend to agree with Kahn. All he had to do was respectfully disagree and let the matter drop. It would have been a story for a day or so.
But he can't.
He spent the day after the convention re-litigating Ted Cruz' dad being part of the JFK assassination, and a day or two ago going back into the Megyn-Kelly-Bleeding bit. :shakeshead: Gonna be a long general campaign.