CaptainBeirutIII: Alright, it’s the year 2099, we can predict future of basically a sperm if we wish, and we do. We examine every pregnancy with the WtFtB scanner (What’s the Future to Bring) scanner.
A woman gets pregnant and it’s discovered that the son she’s about to have is like a new Hitler, who will go on and cause great war, murder loads of innocents and basically be a Satan on earth, but there’s always that +/- 0.00005% accuracy in the scanner.
What is OK to do?
If the decision lies in the hands of the parents of the future Hitler-ish being, then there is no difference between what happens now and what happens in your 2099 scenario. If, however, the decision is made by outside forces (government intervention, for example), then we're in big, big trouble. People wonder where the line should be drawn even now...can you imagine what a Pandora's box would be opened if others could force a woman to abort because of what they fear that child will become? How, then, could any line be drawn?