You don't know shit. Studies are needed, because without studies you get stupidity like this.
Vaccine hesitancy is complex. For instance, black communities are still distrustful of vaccines because of past abuses (e.g. Tuskegee). From what I have read, that has been reduced over the years, but it's not gone. Poor communities might not think the vaccines help them. Hell, it can be something simple like needle phobia (which is very much a factor in people getting vaccines -- in fact, it's probably the real reason for all the MAGA vaccine whining).
Plus, you need studies to know what strategies work best in combatting those factors. What type of outreach works best? Does having nurses go to schools to talk help? Advertising campaigns? Community events?