I think you are the only one saying "proof".Way too many think everything has to prove their fears. Not every event that even neatly coincides with another event means the two events are linked in some nefarious way. They might be linked if all is told. But just because it is too delicious not to consume it as confirmation of your instinct, doesn’t make it true.
Tell me if you believe that this warning proves that vaccines cause blood clots. If so, then tell me why you believe it. If you present some peer reviewed study that shows this, or maybe some verifiable literature that shows Pfizer knew this, fine. But if all you have is your intuition, please say that too.
Proof is not required to question something.