I'm not saying the concern is right or wrong, but...the sort of people who aren't fussy about what they put in their mouths may be off somewhere happily eating a burger from McDonald's.

Being concerned about the quality of what you consume is likely to be correlated with being skeptical about meat substitutes made in a lab. I suspect the whole project of incorporating a little inherent contradiction.

If you tell me meat is not good for my health, or the planet, and I'm convinced, then I'm going to reason that I should probably just minimize my meat consumption and eat things based on age-old recipes, not be a fanatic about meatless purity or seek out weird meat substitutes.

This may not be an obvious point of view if you see avoiding meat as primarily an animal rights issue and associate it with technological progress.

Generalizing the sanity of an entire platform based on one post that you personally find shocking seems a bit extreme, don't you think?

On the contrary! These sort of absurd reductions of logic from people with no business pretending to be experts(e.g. comparing a veggie burger to smoking or blood letting) appear to be very much par for the course here.