^Above is an example of why I was so glad this discussion died. That very same question was asked and answered at least three times.
I think the above post by Oneatatime demonstrates why it is so important that this discussion does
not die. There is an enormous amount of ignorance and misunderstanding on this subject. It's important that we address this, because someday, there WILL be another new virus for which there is no test, just as there was no test for HIV and Hep C when they emerged. Government agencies are reviewing their blood donation policies, partly due to pressure from gay rights groups which are essentially accusing doctors and scientists of basing policy on bigotry. Let's hope they change the policies based on sound medicine, not on political pressure. Because when the next new virus emerges, a few people might get infected by blood transfusions, or many thousands of people might get infected, as happened in the case of HIV and years later, a second time in the case of Hep. C. The likelihood of history repeating itself will depend on the policies that we have in place at the time.
Oneatatime, I understand your concern. However, the fact is that all blood is indeed tested but with millions of blood transfusions occurring each year, even a tiny failure rate in the testing/processing of infected blood will result in people getting HIV and other diseases from blood transfusions. Therefore, in addition to testing every bag of blood donated, people are screened based on risk factors. It is a fact that MSM (men who have sex with men) have the highest risk. IV drug users, and anyone who has had sex with a hemophiliac is also at high risk. This does not mean that all these people are diseased. In fact, very, very few of them actually have any disease. But, if you exclude all the people in these groups, you have a good chance of avoiding those "one-in-a-million" mistakes that occur when testing fails. That's the reason for the "discriminatory" blood donation policies.
In other words, the blood donation policy is not what is unfair. It is the reality of blood-born infections that is unfair. It may be unfair, but it is reality and we can't change it. Better education on the facts and risk factors involved may change this reality one day and reduce the prevalence of infections in the MSM community. If we really care about the MSM community then we will try to help them by facing the tragic and unfair reality instead of pretending that "heterosexuals are just as likely" etc.