Sexually transmitted diseases get that name because they are not very infective. You need close, intimate touch, such as in the case of sexual relations, to be infected. So quarantine isn’t as necessary as in the case of Ebola. Also, AIDS was allowed to run rampant because nobody knew what it was and how to stop it at first. This is very different from a virus whose symptoms and transmission vectors are already known, and where the level of quarantine required is already known.
h/t Ruth Johnston