I have always wondered why hell is necessary? If a person is truly evil in their hearts and will always do evil even in paradise, how hard would it be for god to create a prison specifically for that person? I am thinking if he is god than he could do it in the blink of an eye. Maybe even something matrix like where only that person is real and everything else is fake. Like if that person just murdered the hell out of everyone around him they wouldn't be killing people, just destroying, raping, torturing fakes. Maybe put these evil people on an eternal planet with plenty of food and water, but nothing else?
To me hell is an invention as a sense of justice for those who think they are doing right. It's way to rationalize why good things happen to bad people, because in the end they end up suffering forever. It's way to balance an unfair world where certain people get away with murder and rape (among many other things).