Veer Baki sab shi h I think you should do some research on Genetic mutation, genetics expansion , severe impact of marrying or intercourse in same family and different family samples. It’s good that you have opinions but opinions should be based on research, history and scientific evidences. Things you said about gene preservation had been a myth and absolute bogus and has ruined many genetic orders and families and many deformities are still can be witnessed in modern days families.