One reason I do not believe in hell is, were it to exist, it would make heaven impossible. In other words, the very pleasures of heaven would be rendered ridiculous by the concurrent knowledge that the torturing of vast multitudes was occurring at the very selfsame instant. To accept one’s place in heaven under such terms would be akin to being a 1930s Bolshevik official in Moscow consenting to share a meal with Joseph Stalin even as you know, in conscience-gnawing detail, what it is, exactly, that is being done to your fellow Soviet citizens in distant Siberian gulags. It would be a mark of your own moral concern and basic humanity not to accept an invitation to such a “heavenly” supper table. Likewise, to be the winner of the divine “grace lottery”, and be offered a ticket to the heavenly supper table even as you know that others, no more or less sinful than you, have been given a very different “ticket”, would make heaven completely intolerable (at least for me).
In short, if one were to accept the existence of hell, it would render the ticket to hell and the ticket to heaven ultimately indistinguishable. In heaven, at the bottom of every heart, and at the back of every mind, would be a lake of fire choking love. Of all the human emotions, love would be the most endangered in such a heaven. And the heavenly inhabitants’s knowledge of that lake of fire would relentlessly breed in them an undercurrent of cynicism, nihilism, and demonization. Every pleasure in heaven would conceal this pain, and the price of such a heavenly ticket would be hell indeed. Without infinite supplies of cognitive dissonance, it’s a ticket that one would, eventually, have to simply hand back to the distributor of such heavenly “favors”.