Pure Sulfa or Salvarsan drugs were far more toxic than impure crude penicillin : so what was the fuss REALLY about then ?

Before 1945, an entire generation of doctors world wide (except for perhaps a half dozen of them) were more willing to put pure but toxic sulfa or salvarsan drugs into their patients than put impure but non toxic penicillin into them.

I will go further:  an entire generation of doctors were willing to seen letting their patients DIE, rather than be seen by other doctors as putting an impure substance into those dying patients.