They (We) are railing against Pfizer because the vaccine did not work as advertised by the president you elected: If you get the vaccine, you can't get Covid, you can't give Covid to anyone. Pfizer, under this tag, sold hundreds of millions of doses to the US Govt.
*Now we all have this 'stuff' in our system. We were told it was safe. That's turning out to not necessarily be true for all people either.
The only organization I distrust more than Pfizer is our gov't.