Why Hell? Why not?

Did you know there are websites that allegedly promote kindness. Except, kindness can be hell itself - if the person trying to be kind is merely being nice. Now the difference, which our culture has somewhat conflated, needs clarity: as believers (if you are one) you are called to act kindly. which isn't simple pleasantries or being nice—rather kindness is a deep love, respect, and care for one another, and not cold icy silence when someone offends you, for instance.
The reason I’m mention it is because one of my characters, an angel, she strives to be both kind and honest with Lucifer and her goal is to help him see ’the truth.’ Does her kindness do more harm than good? Perhaps, for later in the story, Yeshu’a himself confronts the angel with Adonai’s truth. It was an eye opener for her and altered her approach to the lord of Hell.
The truth is, Lucifer is a liar and a deceiver - he is trying to get back at Adonai, after all - but there’s more to his role in hell, as well, one I’d not considered until after I read an article about it. That author’s opinion struck me as ’truth', despite the devil’s deceptive ways. I wish I’d kept the article and while I searched for it, I could not find the reference.
In my story, Miriam chastises Lucifer for being who he is. Angry, he storms off. She knows an apology is needed but, more so, Lucifer needs to see himself for who he is and why Miriam cannot love him. As she debates this, terrified of walking the halls of Hell for fear of demons, Yeshu’a confronts Miriam and reminds her of Lucifer’s purpose, which she’s attempting to alter.
Hell is there for a reason. Someone must rule, though God is in control. The infliction of punishment is proportionate to degrees - an outworking of divine justice because God judges righteously (Acts 17:31) and it is a function of God’s justice  to avenge every wrong (Rev. 16:1–7; 19:1–6). Did he assign Lucifer this task when he sent him to Hell? I don’t know.
So in the story, in the interests of divine justice punishment is given out according to the nature of an offense. In the Old Testament a more severe punishment for premeditated murder was given than for accidental homicide. There were cities designated as places of safety if you were fleeing from “relatives seeking revenge” even for an accidental killing; they offered peace and protection.
So there are prescribed measures for various offenses at least in the OT. The nature of the crime, the motivations, and the circumstances - these all determine the measure of punishment. And while Adonai’s in control, someone has to see that the punishment is carried out. Why not Lucifer?
​Now, I don’t know if that’s biblically true. Everyone has a different opinion on that subject, and so, I used my idea or opinion. After all, it’s fantasy in the supernatural or paranormal realm.