I've had more than one person say they really wanted the vaccine to people, but in private once I said I wasn't getting it told me that they were really reluctant to get it too, but felt the need to fake it. I think that's a factor too: some people are pretending to want it, but really deep down don't. Since this raises a ton of issues around who fakes it and who doesn't, and the differences between them, I think that that's part of why I think it's so hard to tell.