I like to think hell is empty because the people who would have been sent there for being foul and wicked are actually people with no souls: they are just p-zombies wandering the world inflicting harm. Thus, when they die, there is no actual soul being released, their matter just ceases to function.

This could also explain why some simple creatures, with no real conscious experience, don’t overpopulate heaven or Hell: they have no souls with which to populate it with. They are just matter, temporarily constructed into some form resembling a living thing.

So hell is empty, and evil is the result of soulless automatons created by accident in our world. So if you die and nothing else happens for you after, then you were a p-zombie, with no soul.