Someone said :
A bit of a point of looking at the overall picture. Its not just men who have sex with men that have exemptions. An excuse cannot be in black and white.
The point is that the other exclusions are justified: taking drugs, being tattooed, having surgery, living in a country during a known prionic outbreak. They are rational, and based on risk-analysis of a behavior.
A blanket ban on all male homosexual is irrational and prejudiced, even if it is a temporary ban. It suggests that any and every sexual behavior of gay men are risky.
It is biased and ineffective. As opposed to the other bans.
It would be like banning any christian from teaching, on the basis of the abnormally high incidence of pedophiles in catholic priests. When the reasonable thing would be to only ban the priests