I have three thoughts and am hoping this is open for discussion.

First, Hell is not a deterrent from disbelief. If one doesn't believe it to exist because the belief requires faith and that lack of faith merits consequences, punishing the individual by proving it exists seems to serve no purpose in setting a precedent for other sinners. It's worth noting that if it could be proven to exist, it would eliminate the concept of faith in the first place.

Secondly, if everything happens for a reason then we are to learn from our mistakes. It can be concluded that the purpose of consequences is rehabilitation. But, what is the purpose of knowledge that can't be used? If the sentence lasts for eternity, what would God have to gain from it?

Finally, is the purpose of Hell to punish the sinner or reward the saint? For me to remain an idealist, I have to live my life believing that those who may do harm to others do so out of misunderstanding, either for what the victim's intentions are or towards a reasonable privilege everyone is entitled to. That being said, it takes quite a great deal of cynicism and bitterness to find comfort in the suffering of others through eternal torture for mistakes they made in this short, complicated life that revolves around logic and reason.