However, the number is still significanctly high within the MSM category, who are recognised as a minority group.
Let us say that hypothetically a gay male and a straight male both sleep with 30 people over a 6 month period. Statistically the gay male is likely to encounter a HIV+ partner before the straight male does and may even encounter numerous partners with HIV, as the transmission rate is significantly higher than heterosexual groups. Sure, the first person the straight guy sleeps with may be HIV+, but you can't create guidelines based on all the vast possibilities which determine risk of HIV exposure. Instead it has to be guided by numbers, and the numbers clearly highlight that MSM donors are at considerably more risk than heterosexual donors.
Believe the attempt to liberalise in favour of gays keeps pretty much all discrimination in practice. Most gay men will have had sex in the past year. That said, I was only voting against because of this principle - I commend the attempt to liberalise and stop the discrimination against gays, and would have voted for had it been a close-run thing.