It's not the entire answer but COVID policy views are much more polarized along ideological lines in the US than elsewhere.
In that sense I'm not sure the issue is misinformation so much as people making (sometimes costly and/or irrational) expressions of political identity. https://t.co/kc4sevUJOFpic.twitter.com/ZRpiF5eckr
Aaaand, in the US vaccine and mask refusal is being pushed by cynical political insterest.
Of course it is.
There is a school board meeting for Manatee County, FL tomorrow night. This was just put out by a local MAGA group, whose leaders have been trained by national organizers on how to disrupt them. Read especially the highlighted part. This is what they are doing everywhere. pic.twitter.com/KMoRzIgLU2