When 1/12 gay white males, and 1/3 gay black males are infected with HIV, it is a risk that is too high to put the general population at risk. Yes, so they screen every single donated unit of
blood for
HIV and several other diseases, but what if one of these gay men or IVDU was infected and had not yet seroconverted, as happened in this case? It is not a risk I am willing to take.