An old tyrannical movie villain dies and a to-be old tyrannical movie villain is born. Billions of people shouldn't be sentenced to death just because the world

An old tyrannical movie villain dies and a to-be old tyrannical movie villain is born. Billions of people shouldn't be sentenced to death just because the world might be a bit better off if a few people weren't immortal. Tyrants aren't even forever even if they never die of old age. After all, tyrants can meet their end through constantly replacing their followers with yes-men to the point of becoming increasingly detached from reality. This may prevent them from noticing certain features of reality such as military incompetence of their force.