AIDS can kill very quickly. Yes, the virus often lays latent for years before something catastrohic happens. In most Western societies, people have seen previously healthy people suddenly get sick and drop dead from AIDS. Think Easy-E of the rap group NWA. Also think of all those homosexual young men in LA that suddenly died in 1981 who had no previous health problems and whose deaths alerted the world to the emergence of a horrifying new disease. As far as Arafat's access to the best health care, he may have been under treatment for HIV or even refused to acknowlege that he had the disease for fear of loss of his stature. Ultimately it does not matter, even under treatment, most HIV patients die of their disease. Many HIV patients are able to lead healthy lives for years on treatment. Others do not. Dying of AIDS is not a crime. On the other hand, Arafat was a criminal regardless of the circumstances of his death.
from the article: Arafat aide calls on Chirac to reveal truth about Arafat's death