Good read on why we have anti Vaccine Hesitancy

https://www.bbc.com/future/article/2...cine-hesitancy

5Cs model, which considers the following psychological factors:

Confidence: the person's trust in the vaccines efficacy and safety, the health services offering them, and the policy makers deciding on their rollout

Complacency: whether or not the person considers the disease itself to be a serious risk to their health

Calculation: the individual's engagement in extensive information searching to weigh up the costs and benefits

Constraints (or convenience): how easy it is for the person in question to access the vaccine

Collective responsibility: the willingness to protect others from infection, through one's own vaccination

I think it gives a kind listing as to why and I'd add a few more like intelligence , race , religion, western medicine , big pharma ,politics, naivety .