Aids should have a stigma. One of the best ways to stop it spreading is to ostracize those who have it. Works great for all kinds of diseases. It's a miracle they haven't all been shipped off to an aids colony. Who should be most protected: The healthy or the walking dead?
If you have aids then, before you get upset, ask if you wish the fucker who gave it to you had been quarantined before you met him. I'm guessing yes.