Plus, we humans are really bad at disentangling cause and effect in daily life. Everyday there's people that get sick or notice something, so if we all take a v

Plus, we humans are really bad at disentangling cause and effect in daily life. Everyday there's people that get sick or notice something, so if we all take a vaccin, by definition some will get sick or notice something right after the vaccin, albeit by accident. That's not to say that's the case here, it's simply why, as the parent (and OP) also states (so I think we're all on the same page here, just adding another thought), research is important.