I kind of get that, though I have two problems with that. First, it doesn't explain why CRISPR is, itself, scary. It's a technique, and while it might allow some morally questionable science to take place, that's true of practically every technique imaginable. CRISPR isn't suddenly making designer babies a reality, any more than zinc fingers or TALENs have. Second, I'm not really sure why we should fear designer babies. There's some moral questions involved in genetically altering our offspring, but I don't see them as any more problematic than any of the other means we use to "design" our children. Being able to do so on an individual gene level may upset some people, but I just don't see how that's more disquieting than, say, in vitro selection or genetic screening. Maybe some people find those problematic as well, but that means CRISPR isn't breaking new ground in their minds.