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Which philosophical (not theological) works on hell helped inform your view?
I haven't read many philosophical works on hell, most seem to be theological. The only ones that spring instantly to mind are Talbott and Kronen & Reitan.
It was just reflections on Quran mainly at a time where I had 28 problems with Quran then 42, then I started solving them one by one. But despite solving them all, I didn't believe in Islam for two years, simply on this issue. I believed belief in hell was irrational and that a God that forgives evil people and doesn't punish them is better then a God that punishes.
With two years of reflecting on this, after one year in which I solved the 42 rational problems (contradictions etc) I created in my head and mainly due to not understanding how language works, it took me two years to reflect over this issue. This is not an easy issue, which is perhaps why the subject is repeated over and over again, so as to warn yes, but Quran says disbelievers in general won't believe if you warn them anyways nor fear in this respect, so to me, it's more about proving it although warning them is part of it, it's not the main reason it's repeated with different subjects.
I had to find my sense of vengeance first, and it's not easy to do so. Mental clarity with regards to morals is usually not easy, let alone theology, let alone morals related to theology.
I believed for years that vengeance and belief in hell was wrong in this respect.