Or, when a woman gets a flu shot and then has a miscarriage, she doesn’t assume it was because of the flu shot, because she’s had a flu shot many times before. It seems like you’re being deliberately obtuse here.
I think I’m being very transparent and open minded. I’ll admit your hypothesis about the mundaneness of flu shots is very possible. My only point is that that hypothesis or some other hypothesis needs to be confirmed by experts. Instead the only people we have commenting on this are right wing pundits that have their own axe to grind.