With that kind of argument, you could also say that our current situation is proper route to hell because psychopath babies are being born constantly, or idk joung people becoming psychopaths or however that works. Sure often, once a psychopath is in power, waiting for them to die of a natural cause is the easiest way of removing them. And surely, if you take the most cruel ruler each country ever had, put them into power right now, and made them never die, it would be proper hell. But that scenario is entirely artificial. Currently, and throughout history, most people in power aren't cruel psychopaths of the likes of Stalin and Hitler. We just remember the cruel ones more than we remember the boring non-cruel ones.

Unless in an aging-free world, for some reason non-psychopaths are more likely to give their power to psychopaths than the other way round, I think we don't need to worry.