Yes, it is horrific. But it's important to point out that Africa is not a country: it's an enormous continent containing more than 50 countries with a wide variety of languages, cultures and religions. Africa is the size of China, India, the USA, Mexico and most of Europe... combined! Just think of how many different cultures and languages are represented by that area, and you'll have some inkling of what Africa truly is.
This practice is mostly confined to a few countries in the Great Lakes region of East Africa (particularly Tanzania and its neighbours). So please don't paint the other 50-odd countries in the same light: it's a very rare thing indeed throughout most of the continent and most Africans find this practice as abhorrent as you & I do.
It's nothing to do with voodoo (which is Haitian, not African) or special powers: it's muti, which is traditional African medicine. It's widely believed in that part of Africa that using pale-skinned body parts in a potion can bring prosperity to the person who uses it. So it's not just albinos who've been affected: children of European & East Asian descent have been victims of this too.
As this is a cultural issue, the only solution is education. It'll take a long time to get rid of that entrenched superstition, but it can and will happen. The Internet will help enormously.