There's so many things at play here. There's the fact that sticking a needle in your arm really seems like something intrusive. People are afraid of needles; they find the whole thing unpleasant. They certainly find it unpleasant to have someone do it to their kids. And it's interesting to consider how the debate here would be different if the vaccine were delivered as a chewable gummy or as a nasal spray. I think that would feel different to many people.