Let's be clear, they have no arguments that rely on any sort of rational discourse. No "strategy", or clever approach to the problem will convince them they are wrong.

I'm honestly not sure you're actually arguing in good faith here. You've offered no path that would address the issue other than hand waving and saying "fighting will make it worse", and "we should let it run its course". I'm saying that there is no "run its course", they aren't gonna just give up and go home if you stop fighting, and they aren't all gonna just die if measles either (thanks to the above mentioned herd immunity we all protect them with).

You say you've vaccinated your kids. Lucky you. Maybe realize you're privileged to have been able to do that and stop telling those less fortunate they'll just have to let their loved ones die from preventable diseases lest we make a bunch of crackpot conspiracy theorists' "arguments more plausible".