As a generalization.
I'm sure many unvaccinated people remain very cautious but the majority of the current cases in the hospital here, higher percentage in the ICU, even higher percentage in the morgue are unvaccinated. Maybe they figured they wouldn't be the ones with the more severe cases.
What I heard on NPR last week was that a second J&J increased antibodies by only 4%. Moderna or Pfizer as a J&J follow on was 90%.
The J&J one shot was listed as 66% effective against getting a moderate to severe case (though very effective against hospitalization or the morgue) whereas Moderna and Pfizer (2 shots) are 90+% effective against getting a symptomatic case and even more effective against a trip to the hospital or the morgue.
Fortunately both Pfizer and Moderna were available when I became eligible early March. Had it been J&J available with Pfizer and Moderna "coming soon" I would have waited. I see no reason at all to take a vaccine that would rate a D grade when there are A grade options. The only reason I can come up with is if there is no ability to store the mRNA vaccines at the required low temps in some remote areas.
WHYY article
I favor not getting sick to having to deal with it after the fact. Plenty of people never need to go to the hospital but plenty do and plenty die. The vaccines approved in the USA have shown extremely low risk.
The last case of natural smallpox occurred in Somalia in 1977, and the World Health Organization declared it to be eradicated in 1980.
https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-details/smallpox-vaccine