People fail to understand the perfect righteousness of God, The Pharisees failed to realise this also when Jesus himslef had broke the sabbath.
It is God who only knows when someone is capable of receiving the Truth, and at what age they are able to understand it, sending little children to hell is making a mockery of God and His perfect judgment.
It is written:Revelation 19:2 - For true and righteous are his judgments: for he hath judged the great whore, which did corrupt the earth with her fornication, and hath avenged the blood of his servants at her hand.
If people don't realise this now, then they will soon realise this in the hereafter.
God Bless!
Matthew 23:23 - Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.