Look, I get the appeal. The idea of editing out a fatal genetic disease before birth sounds like pure medicine. But let's be honest about what we're actually doing here. We're talking about making permanent, heritable changes to the human gene pool based on our current, still very limited understanding of genetics. We don't fully understand how genes interact. A edit that fixes one thing could silently break another, and that mistake doesn't just affect one person—it gets passed down to every generation after them.
The science isn't there. We've seen off-target edits cause unintended mutations in animal studies. We don't have peer-reviewed evidence showing we can do this safely in human embryos. And "safe" isn't just about the embryo surviving—it's about the adult that embryo becomes, and their children, and their children's children.
Once you open that door, you're also deciding which genes are worth keeping. That's a medical and moral minefield we aren't ready for. We need to wait until the evidence actually supports it.