Many of the individuals currently refusing vaccines in the US didn't just decide, there was an active effort made to convince them not to get one:
> Had the US continued to vaccinate in the summer at the same rate as in the spring, the US would be near herd immunity by now. It took a lot of work by powerful people and institutions to prevent that outcome. It didn't just *happen.* It was *done.*
* https://twitter.com/davidfrum/status/1416215130656882688
> COVID vaccine refusal was not some unprompted, spontaneous reaction among pro-Trump Americans. It was manufactured: first as part of a larger program of denial to cover for Trump's pandemic failures; then after Trump lost, in order to stoke feelings of victimhood and persecution.
* https://twitter.com/davidfrum/status/1416408864027824131
People think that either (a) COVID itself is a hoax or not that bad, or (b) that the vaccines are a hoax:
* https://www.bbc.com/news/world-us-canada-57958358
* https://www.montgomeryadvertiser.com/story/news/2021/07/23/a...
These beliefs are highly correlated with where you sit on the political spectrum in the US, and probably your primary news sources.