What is the purpose of eternal Hell?

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Mr Khan said:

Yujiro said:
There isn't a Hell to begin with it's just to try and stop naive people that believe in that religious drivel from doing bad things.

No different from parents telling kids about Santas naughty list.

Now, posts like this aren't constructive. I get being non-religious, i'm patently agnostic myself, but this thread is not for questioning the merits of religion period, but to have a debate on what could be the cosmological or teleological reasonings behind having a permanent punishment for deceased souls.

I agree with Khan

 @Yujiro what your purpose with that comment? Obviously you're either just trying to get under the skin of religous folks, or you are just not the brightest crayon in the box.