I'm gonna add my voice to Ladislaus' question. And I believe in Baptism of Desire.
If an infant dies in infancy, without baptism, they had no chance of salvation, yet they go to Limbo.
So why is it UNJUST for God to similarly sentence an adult who has never heard the gospel or committed a mortal sin to Limbo?
I can see why it would be unjust if God sentenced them to eternal torment. I think that would be unjust, as far as I can understand. But how is anyone owed the beatific vision, or even a chance at it? Isn't saying that anyone is owed such a thing pelagian?