Nada
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Well,God is the creator of the universe, and the Almighty.What He see's fit is what goes.We are nobody to question His universal Sovereignty.What He deems as just is just.He is the all wise and all knowing.We cannot understand godly wisdom trying to use human wisdom.Remember too,God did not kill them with fire.He did not declare eternal judicial judgment upon them.These children were killed by bears and they will more than likely be resurrected later.I hear what you are saying but they were still "little children." How responsible are little children for themselves that they should be put to death for mocking a prophet?