So we can't justify the idea that babies go to hell because it's quite clear that babies, particularly those that are unborn, have never sinned, And thus would not deserve any form of punishment. So instead to retreat to this mysterious aspect of a "sin nature". One that clearly an unborn baby has no control over.
Which essentially amounts to God punishing babies in hellfire merely for being conceived.
I think this is just theology gone wrong. This is the polar opposite of Jesus being sent to save. But it goes one step further and suggesting that Jesus wouldn't even save them all, but rather perhaps just an elect few.
Rather than bringing balance and defeating sin and rectifying the brokenness of creation, it sounds more like acceptance of broken creation, and acceptance of broken hellbound eternity for the innocent.
Surely this cannot be the character of God.