"Why is it reasonable to believe in prisons, but not in the hell?"

[FlatAssembler]

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Well, maybe. Still, many atheists use the argument that hell would not be justice as an argument against its existence, and I think it is a relatively convincing argument. 

Allow me to suggest that you've misunderstood the objection in addition to misunderstanding valid inference.  Whether we sub in hell or prison, the argument is invalid for precisely the same reason.  They're both non sequiturs.

The injustice of hell is a comment on the moral status of a competent god, not the existence of hell.  Just as the injustice of a prison is a comment on the moral status of a competent system, not the existence of prisons.

Makes some sense. After all, what I said in my video regarding justice of afterlife is:

Moderator Notice
Non-English bit removed. You’ve been told about this. Don’t do it again.

That is more of a counter-argument to For there to be justice in the world, afterlife has to exist. If all those evil people don't get punished in the afterlife, when do they get punished?, rather than an argument against the existence of afterlife itself.