The pushers of antivaxx perhaps, but even then the meme itself (bear with me) is strong enough that there were numerous enough anti-vaxxers to make a difference (and I'm not just counting COVID here).

For why the meme alone makes it important to be kind: Just because I can only explain the pushers with conflict theory and neo-phobia, and just because I find those things to be incomprehensible, (1) sane people can still be convinced by such people (my MMR was delayed because whatshisname did actually get published), and (2) it's common enough to count as part of the human condition.