As for this committeeman resigning, it is indeed very sad. Years and years of hard work and time down the drain. My hunch is he isn't the first one to resign nor the last...the GOP continues to slowly unravel.
I have zero respect/sympathy for people who cut and run when things get tough.
Lots of people don't like Trump, for a lot of good reasons. He happened to win the nomination this time through an unlucky combination of GOP-screw-ups - like ignoring voters on issues like immigration for too long - and a more general electorate anger at the political establishment. So, we lost one. And if you don't like the, it's perfectly legitimate not to vote for him.
But to cut and run leaves the party to the Trumpists who only managed to obtain a plurality because of those unusual events. It won't happen again because Trump has no "movement" behind him, and no staying power other than his own personality. And, the dude is 70. So weather this election, then fight back after November. Tossing everything overboard because of one anomalous primary is juvenile.
I say that with respect to whiny conservatives. This particular guy sounds like a whiny liberal, so good riddance.