https://www.yahoo.com/news/articles/trump-admin-threatens-withhold-hiv-192256406.html
The US acts as if its AIDS treatment and prevention programmes are rooted in altruism. That's never been the case. These were opportunities for the Empire to exercise soft power, make contacts, lay foundations for future business investment, and establish relationships with political leaders. It's always been about the fact that if the US doesn't do this, then some other powerful nation will.