By suggesting that gay and bisexual men are at risk for HIV and straight people aren't, the FDA's guidelines misinform the public. To the extent that it contributes to ignorance of the risks associated with certain types of heterosexual sex, the FDA's policy, even in its revised form, actually presents a public-health concern.
If you're a black man, it doesn't matter how many degrees you hold. It doesn't matter how much money you make. It doesn't matter where you live or what kind of car you drive; to some you're still a n*****, and that is the cold, hard truth about the world we live in today, and it's what my parents had to teach me growing up. I don't experience this with my identity as a gay man.
Many people seem fixated on the fact that the actual cause of homosexuality has not yet been established with any degree of certainty. As someone who likes to understand the reasons things occur, I respect and appreciate the curiosity. However, the ultimate result remains the same, regardless of whether the cause is genetic, environmental, or some combination of the two.