So God tortured man A to show man B how charitable God is.
That does not make a shred of sense. If I poke you in the eye to get Bill to like me that make me a jerk.
I am glad you want to be very logical about this.
Here in lies the problem:
An analogy:
You give your children a list of things you do not want them to do, but how do you convey the fact somethings are much worse to do them other things?
We have different degrees of “discipline” or punishments to convey what is a great offence severity to let them know and understand what is really bad. This is the best way for the child to realize the significance of the offence.
God as a Loving wonderful parent can easily forgive us, but forgiveness is a transaction requiring the receiver of the forgiveness to humbly accept that forgiveness as purely undeserved charity. Also, as a wonderful loving Parent, God needs to see to our Loving discipline if at all possible, for all the benefit disciplining provides. Refusing to humbly accept God’s Loving forgiveness and discipline results in us remaining under the threat of being “punished”.
If you are talking about Christ being tortured, humiliated and murdered, God did not do that, but God was willing to allow a willing Christ to go through all that out of Love for humans, to provide the only way followers could be fairly/justly disciplined for their sins without physically dying (empathetically being crucified with Christ).
If you are talking about children, God Loves, but allows them to go to hell (annihilation with maybe some torture for the really bad individuals), then you need to realize the following:
1. God gives the “punishment” for rebellious disobedience to: show the severity of sin and the Love found in his forgiveness.
2. If sin was not very significant then God’s forgiveness would not be very significant, so those forgiven by God would be forgiven of little and thus have little love.
3. The only way people can obtain an unbelievable huge Godly type Love is by accepting forgiveness of an unbelievable huge debt (sins create such a debt), so they can have an unbelievable huge Love (Godly type Love).
Those who refuse God’s charity to the point of never correctly accepting God’s charity, are beyond God’s helping them, since they refuse His help and God is not going to force His Love on someone refusing, since that would be like a shotgun wedding with God holding the shotgun (not Loving on God’s part nor the love received in such a way is not Godly type Love). These refusers of God’s Love would not be happy in heaven, since heaven is like one huge Love Feast, but only of Godly type Love, which the refuse does not want. There is really no-good place for those who do not like Godly type Love to go after death, but they can go to hell (annihilation) to show others, God is very serious about unforgiven sin and they need to not tarry in their acceptance.
How might you get people of their own free will to humbly accept forgiveness of an unbelievable huge debt, so they could have this unbelievable huge Love?