I'd much rather have these discussions be transparent, with lots of feedback, than have them happen behind closed doors, where groupthink can take hold.
I realise that misinformation sucks really badly and costs lives. I'm also really averse to powerful people developing bad ideas and executing them without the rest of us being involved.
It's not posting online that makes that cinematographer an anti-vaxxer; they already were one. But it might be how they stop being one.