It is true that we should preserve our norms. The fact is that we are greed. When we find that western norms benefit us we go there and we also take African norms when they benefit us. In this developing world we cannot live only on our cultures. We must interact with other people and copy from them what is right. If you look at yourself you are far much improved than your people of previous generations. We expect our children to develop better that us. I wouldn't happy to be better than my offspring.