I wonder if you realize how foolish you sound.
Every trait has a tradeoff. Evolution has no master plan, it has no absolutes, the superiority of one trait over another depends on environment and luck. It is not an accident that sickle-cell is a prevalent trait amongst those of recent african descent. Environmentally, living in africa presents a greater likelihood of dying from malaria. The sickle-cell trait protects the individual from malaria. In that population, it's a survival trait, as I said, in spite of that fact that getting copies of it from both parents is fatal. It is statistics, my friend.
Outside of Africa, particulary north European types, malaria is not a big issue. Sickle-cell in THAT population is NOT a survival trait, and is slowly disappearing amongst people of african descent who live in the north. They are also getting whiter, since black skin protects from heavy sun in africa but entirely blocks the diminished wavelengths needed to produce vitamin D in the skin, thereby causing rickets, a particular scourge of black people, especially nursing black mothers, and one reason why many countries add vitamin D to milk. Blackness is not a useful survival trait in northern climes.
Human evolution is a fascinating subject. You would do well to study it before demonstrating such cocky stupidity in public again.
