Collective sins?  Give me a break.  Slavery happened in the United States because africans sold each other to Europeans.  Read some history.  Westerners as opportunists, you bet. All people are.  I'm sorry, but the last african country was liberated over 60 years ago, and most have been independent longer.  If you can't get some progress, you're hopeless.  Also, having 10 children per woman doesn't help.  What these people need are condoms.