Possibly related to the links between extraversion and narcissism and the latter groups know-better-than-the-experts approach to science, and indicated vaccine-resistance.
Eg.
https://www.psu.edu/news/story/people-high-narcissism-less-l...
Eg.
https://www.psu.edu/news/story/people-high-narcissism-less-l...
Its more like, "Everyone needs to do X so that everyone can BE safer."
The weakest link in a chain ...
No. "Everybody must do X so we are more safe". Given that you're mentioning the evidence, the effectiveness of covid vaccines isn't about feelings. The narcissism is of course in the notion "everyone else will be less safe, because I want to feel more free."
Why are you assuming that it’s “I” and not “everyone”? In my experience it’s the latter.