We might make humans who don't suffer from ailments or who are beautiful. But we might also create people who have terrible, irreparable problems. Those people

We might make humans who don't suffer from ailments or who are beautiful. But we might also create people who have terrible, irreparable problems. Those people might die from the problems. Small genetic modifications cause awful, devastating illnesses. Artificial genome modifications can be done pretty reliably, but we know it's not foolproof. We also have no way to check our work or debug potential genetic issues. We're flying entirely blind, and our hubris can (and in all likelihood, will) result in terrible suffering and death until we get FAR better at doing this.