The beauty of this particular initiative is that it not only has a proper moral aspect, but it's also good policy in and of itself: saving lives in Africa now, will almost certainly end up saving us money and trouble in the future. In that sense, it's more like an investment.
The money and the drugs probably did very little. My guess is that an attitude shift came to Africa. Before it was that "Men will be men" and nothing can be done about it. Now, it is likely to be, something can be done about it "Men Behave!".
Oh, if only our own nation would repent "Thou shalt not commit adultery" is not just an option.