Trump policy is vax available, but not mandatory. Why is anti-vax rhetoric necessary? Don't get it if you don't want to. Trump has said ant-vax talk plays into DS's hand. Guess he means what he says.
Vax, then, must not be the issue that is the top priority for rolling out TS. It just gets in the way. There's other places to go if you want to read anti-vax stuff.
It's the buggy whip syndrome. If you made a name for yourself as an anti-vaxxer, and got a lucrative number of hits, you don't want that gig to become irrelevant. Not a good look trying to leave your scent mark on someone else's new platform because the buzzer went off on your 15 minutes.