I think the US is doing enough to fight AIDS. We spend more money than any other country on foreign aid as well as research. We have done a good job controlling AIDS in this country. We can't be the sole parental figure for the rest of the world. Sometimes, the rest of the world needs to step up and join the fight.
As a general rule, the United States does not do enough to combat any disease. We have a ridiculously strong aversion to providing quality health care, and the cost of AIDS medication and treatment make it cost prohibitive for most to successfully undertake. Preventative measures fall into the same category - the simple measures are not for my agency to bear, let somebody else deal with.
The CDC reports significant rises in new HIV infections in all risk groups in the United States between 2008 and 2010. The most important weapon in the fight against AIDS is education, and it is clear from these statistics that not education is being done on the topic to prevent dangerous choices and unhealthy sexual practices.
Since the late 80's and 90's, AIDS has seen a dramatic decline in mainstream media attention. As a result, funding has seen a similar decline. The amount of people infected with AIDS has not seen a decline at all. Unfortunately, the public, generally, will support the cause that is toady's news, not yesterdays.