Convalescent plasma could also spread many diseas

Convalescent plasma could also spread many diseases caused by unknown or undetected carcinogens, viruses, and bacteria just like the tainted blood transfusions common during the AIDS epidemic. The "experts" predictably ignore or downplayed the risks then and now. I wonder if we will ever know how many thousands will die or become diseased over the next fifty years because of their arrogance. They tell us to wash our hands with poisons and then brazenly inject poisons and pathogens into our bodies. How did science come to this?