I think a big part of it is that the different vaccines are different types of bad. I don’t have any proof, but there being 3 different pools of side effects for J&J, Pfizer, and Moderna would go a long way to explaining the vast range of side effects. There is also the factor that has to be acknowledged that sometimes a coincidence of a medical issue after a vaccine is simply a vaccine, and given how little data we have of how common each reported side effect is, it’s simply a bitch to sort through the side effects and the relatively rare coincidental medical problem, which over inflates the range of side effects. Without us having any access to a lot of this data on what the vaccines do in clinical trials, we have to do a lot of guesswork and that leads to some imprecision.