[arkh]

It is. But if you close your mind enough you can't even think about those kind of argument and follow the kind of thinking some people do, how can you mount a valid argument against it?

It's heinous! Eugenics bad! Are not good arguments. You have to try and follow thoughts along ways you (and most people you know) don't or you end-up creating your own echo chamber. Try playing devil's advocate sometimes you may learn a lot about how you think and why.