We are really wading into conspiracy waters here, but there must be SOME explanation for the difference between the vaccines’ effects on European and American professional athletes. If even a couple of NFL or NBA players died after the vaccines, or collapsed on the field, it would raise way too many questions and upset the whole “vaccinate everyone” narrative.
One explanation is that like Aaron Rodgers, the quarterback from the Green Bay Packers, American athletes rightly didn't get the Jim Jones Jab.
It looks like there are different batches with different effects.
I noticed in my state (CT) there are relatively few bad side effects—I think they either used a placebo or relatively harmless batch.
Bottom line—this is Russian Roulette on a grand scale.
The boosters are just the next pulls of the trigger—anything could happen.
One other possible reason is fraud, I bet there's a lot of "Hey Doc, $10K and you shoot that vaccine down the sink drain and still fill out the card".
In Europe most doctors work for the government and the players have no choice who to go to, where as here, the players can go to their own doctor.