I'm really pleased you found the link interesting, as do I, JenniferEccles. Sounds like you've read it too suziewoozie.
This link is about research done at Oxford University into vaccine hesitancy. It's really accessible.
www.ox.ac.uk/news/science-blog/covid-19-vaccine-hesitancy-uk
The following extract, from the above, is pertinent to your question suziewoozie, although is doesn't explain everything:
"The fear that vaccine hesitancy may be going mainstream is borne out by the fact that, in our survey, mistrust wasn’t confined to particular groups; on the contrary, it was evident across the population. Hesitancy was slightly higher in young people, women, those on lower income, and people of Black ethnicity, but the size of the associations was very small. So we can’t explain COVID-19 vaccine hesitancy by reference to socio-demographic factors."
Many years ago I was involved in the psychology field and attended a seminar about beliefs. The leading psychologist said we act as if our beliefs are true, whether or not they are. They're principles we develop that guide us through life. But, they're generalisations which, seemingly, are based on our past experiences and form our future reactions. They're not facts but we have a tendency to cherry-pick notions that support our beliefs and dispel contradictions. Beliefs may not be logical and they may not be proved.
We can work to change our beliefs as they're not set in stone. However, we have to have the desire and/or resources to do so.
I could continue but don't want to turn this into an essay!
Stay safe & well everyone.