I am not beating up on you, much less for your understandable sympathy for a friend, innocent of misbehavior. I have acquaintances who are hemophiliac but not HIV positive. Hemophiliacs also need protection from the libertinian lavenders (who might donate blood) who don't really care who dies so long as they get their kicks.
Quarantine is not punishment. It is medical and public health prudence. We can separate hemophiliacs from others but let us not allow the exceptions to swallow the rule. Bill Buckley once advocated tattoos in the intimate areas of the HIV positive as a clear warning to the uninfected lavenders or others.
Tuberculosis and HIV differ in their symptoms and their transmission. Quarantine would not have as much of an effect on the AIDs virus.