Why do we care about mild adverse effects?

1) mild adverse effects in a small trial may be associated with rarer severe adverse effects in a large population.

2) antivax propaganda has left all too much of the public skittish about this vaccine. Adverse effects won’t help.
I’m not an expert on this at all but I am concerned by the fever numbers here. I’d have thought that e.g. flu vaccine generates fever in more like 1-2 percent of patients.

(I would still get a COVID vaccine even if fever was virtually guaranteed, provided severe effects rare.)
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