I had a thought I stuck on the end of my tl;dr post
here, but I think it's probably worth mentioning in a new thread to get some thoughts.
One of the non-sensical things about hell is the idea that there can be truely just punishment for sins. If I have the right idea about Islamic theology (maybe someone can correct/confirm?), only shirk is punished eternally, but other sins are punished by a certain amount of time under torture, and it is the intention behind your deeds that you are punished for.
That seems very much to depend on the assumption that intention (and suffering caused) can be well defined and weighed as deserving a certain quantity of punishment. The problem is that human thoughts fluctuate and are vague, so how could a bad intention ever be precisely defined and quantified, even in principle? We all hear people say "I'm not sure what I really want". Similarly, how could suffering you caused ever be quantified to calculate punishment by means of a different kind of suffering (extreme heat)?
This sort of problem seems like an easy way to show that punishments in hell (and similarly rewards in heaven) is nonsense based on simplistic, human abstractions.