They might have had some excuse for not knowing in 1985.
But 30 years down the road?
That's plum stupid. And willfully irresponsible.
Who are they going to blame? Obama?
That's easy. Reagan-Bush.
Even during the 1980s, they felt pretty certain that unprotected sexual contact spread HIV, and given the vast majority at the time that was homosexual men, they were also pretty certain it was unprotected intimacy between men, plus their promiscuity, that was a major factor in spreading HIV.