It does prevent life which is true. And circumcision brings down the AIDs rate.
Condom use is virtually 100% effective and relatively cheap. We should abandon that completely in favor of something with <50% efficacy, that costs much more, and would result in more unneeded children? Especially when there's no reason they can't be used in conjunction? That's absurd.
It would be great if we could reasonably expect Africans to be completely sexually abstinent, but condoms are by far the most effective policy, in terms of life saved per dollar. If you have theological hang-ups about them, that's fine, but the trade-off is that more people in Africa die in their absence. Empirics show that there is no indication that there are more cost-effective solutions. Period.