If one of these modern day experiments went wrong, and you found that you were the last remaining male/female left on earth, then after a while you realised there was just one remaining person of the opposite sex, would you feel it right to go ahead and mate solely for the purpose of keeping our species going, or do you think it would be best left alone, considering all the illnesses, and warfare going on on this planet, Or would you think earth would be better off without humans, and just let it pass.