Earlier quoted context omitted.
What do you mean? It's selective breeding for humans the same as we do for farm animals and cats and dogs. It's not pseudoscientific.
No - it's pseudo moral. It's reviled because proponents are reliably racist idiots who don't even understand the limits of the science - or why breeding humans like farm animals really isn't such a great idea.
It's reviled because it's inherently immoral. Its proponents are indeed usually racist idiots, but even if they had the best of intentions, it would still be immoral.