For people who still have open minds about vaccines, it's true that some are riskier than others. Adverse reactions do happen, either because of existing co-morbidities or just dumb luck.
That being said, it's worth noting how often they occur and how serious they are, as well as the reduction of risk over a dangerous disease.
Take Measles, a disease that is 5 -10 times more infectious than Covid-19. It's so infectious it tends to burn itself out. You get outbreaks that everyone who lacks immunity catches (with the expected deaths and life altering damage), then it goes away for a few years until until a carrier infects a batch of people who lack immunity (typically children). However it also kills roughly 2 per thousand people who get it.
Now the vaccines can have side effects, some of them serious. The WHO has a nice summary but there are fatal or life altering conditions that do crop up. They're roughly in the 10 per million range. Which means it's roughly 100 times more dangerous to not have the MMR than to have it, even ignoring Mumps and Rubella.
If there were a new version of measles then it'd sweep the country and kill 120,000 or so. Or you could (assuming the mythical vaccine existed for this mythical Measles 2 disease) vaccinate and kill roughly 1,200.
The bit that really annoys me is that most of the antivaxxers would be really low risk, but by refusing vaccines they risk the deaths of people who can't have them. It's the same situation with people complaining about BLM and Covid-19, people risking others lives because they think the risk is worth it.
Except one is protesting about institutional racism and the others don't want to pollute their chakras or anger sky faries.
[/rant]