You ignore the fact that no one is forced to endure the misery of separation from God. It is self-inflicted as the result of pride and the desire for total independence. Moreover it is not unmitigated misery because there is great satisfaction and pleasure in being totally independent. Otherwise no one would opt for hell. Don’t you ever find it irksome to be compelled to obey authority? I know I do.
Allow me to provide an anaology to this hell scenerio (totally conjecture based hell theory as there is zero reason to assume your description of hell is accurate as opposed to the scripture based hell as eternal physical punishment):
Imagine that the next time I met my friend Dan I ask him “Hey Dan, how’s your son 6 year old son Ben”?
He replies, "Not well…he has fallen into the pit I dug in my backyard and can’t get out. He’ll likely starve to death over the next 20 - 30 days”.
“Oh my gosh, " I reply “that’s horrible. Can’t you get him out”?
“Well yes…of course I could, but here’s the deal: Two years ago, I warned him not to get near that pit, and here he goes, two years later and falls into it. He deserves his fate, and if I rescued him…which I easily could…he would not learn a lesson from this sad experience. Like I said, I warned him to stay away from that hole. Ultimately, if he loved me, he’d have listened to my rule and avoided the pit. He has choosen his fate”.
“But…but…he’s just 6 years old…you’re his father… You can’t just let him starve to death in that hole”!
“Listen, I love Ben more than anything. I love him with my whole heart, but he was warned two years ago…he deserves his horrible fate”.
“If you warned him, why did he get near the hole? I mean outside of the fact that he’s just a finite child with an extremely limited understanding of the world and of the consequences of his actions. Plus it’s been 2000 years, I mean 2 years since you last instructed him as to you expectations”.
“Well, he was trying to get the toys and candy that were in the pit”.
“TOYS AND CANDY! Why were there toys and candy in the pit”?
“Well, I let my other evil son Stan place them there, you know, to lure Ben into the pit”.
“Why do you allow you son to do that”!
“Why should I attempt to stop him, after all Ben has been warned to stay away from the pit? How many chances do I have to give him? Here’s the deal, Ben’s not the first of my many children to fall in that pit, nor will he be the last. To be my loving child, one must obey my commands…it’s that simple”.
Ask yourself, what’s your opinion of Dan’s parenting skills? If Dan allows this to happen, does Dan truly love his son or does he hate him? How is Dan’s attitude any different from that of a God who would allow his own creation to suffer eternal hell? Can Dan really claim that this is not his fault? At least the son’s torment will be over in 20 -30 days; Your God would mercifully allows us to suffer for an eternity if we anger him or fail to love him according to his demands.