Oh yes, the anti-vax nonsense. I flagged some of that as well. But on steemit this kind of nonsense seems to be backed by incredible amounts of steem power (even by some witnesses). Some anti-vax posters are making $$$ with their ignorance of science, in these cases a downvote from me probably wouldn't even been noticed. In the comment sections of these posts there are endless discussions with the same arguments repeated again and again, however, these anti-vax people seem to be very resistant to scientific facts.