Hell is for Burning People like Garbage
Those who dismiss Hell as a metaphor that uses the local garbage dump as a symbol for death or whatnot are missing a certain point: The reality of God sending people to Hell is similar to burning your garbage! It's not an insult. It's a necessity for the same types of reasons that a whole culture who burns garbage does so. It's the only way to deal with and the only place to put irretrievably corrupted human beings and fallen angels.
Unlike the method of putting garbage in a static landfill, breaking it down to its component parts destroys it along with its impurities, except in the fumes that come from it and remain toxic until they are dissipated. I don't know the intricacies, so the metaphor might be useful in a greater or only a lesser fullness, but I do know that those people who are in Hell for no less than the thousand years of the Millennial Reign of Christ are taken out of there whole enough to be judged, their names not found in the Book of Life, and then thrown into the Lake of Fire.
Whatever metaphorical analog Hell has with a burning garbage dump, we should be exceedingly wary of going there, to say the least. The metaphorical component doesn't reduce real Hell to a metaphor, but accentuates the description of real Hell with the horrors of the metaphor.