The main purpose of any punishment is usually to rehabilitate offenders, to protect innocent people, and to deter people from committing crimes. If a punishment, or traits of a punishment, doesn't work to accomplishing these goals, then I'm not sure what its purpose could possibly be. Such a "punishment" might be created just so the convictor can fulfill a sick desire to watch other people suffer. If an eternal Hell does exist, lets try to see what its purposes may be.
An eternal Hell does not allow for rehabilitation. Obviously rehabilitation would be impossible to do with eternal Hell because the offender would never have the chance to re-enter the world. God doesn’t even give them the chance to improve themselves. Also consider the fact that if a God wanted to, he could rehabilitate his offenders through non-forcing methods. It's clear that God has the option to rehabilitate sinners, yet chooses to watch them suffer.
An eternal Hell is not necessary for protection. For humans, prisons are often the only way to protect the public from dangerous criminals. So sometimes criminals are placed in prison for their entire life. However, God would have infinite options to protect the “good” people. He could send offenders to an isolated place without inducing eternal suffering or he could just end their consciousness altogether, etc. There are plenty of less painful, yet equally effective alternatives to protect innocent people.
An eternal Hell is not necessary for deterrence. God could make Hell last “only” one-million years and it would be just as effective a deterrent as an eternal Hell. Anyone who isn’t deterred by one-million years of Hell either (a) doesn’t believe in God, or (b) just doesn’t care about his future. Either way, extending the length of Hell to eternity wouldn’t change this person’s mind. So again, God has less painful, yet equally effective methods to deter potential sinners.
It looks to me like God just enjoys watching humans suffer. God has multiple options to handle sinners. Some options cause infinite suffering and harm. Others are not so painful, yet are just as effective for any practical purposes. Yet God chooses the options that cause infinite suffering and harm. And for what reason Can anyone give me any practical reasons for making Hell last an eternity? I cannot think of any.










