Unknown and unknowable. This is a philosophical and intellectual question that is very personal to the person feeling it. One might consider it akin to the meaning of life or why the universe exists.

I think is more than that. Rather, are we trapped into deterministic illusion where we don't have choice. For example, the Many-Worlds Interpretation (MWI) of quantum mechanics is one theory and might make it possible. The described hell is the life we cannot change and the unknown portion whether we are in a such world or not.