That may be some people's "underlying premise," but it's not mine. As I've said before, "The wonder of God's mercy and grace is NOT that He doesn't save everyone; it is that He even saves ANYONE!"
This is the very essence of what I believe, even as a non-Calvinist. God is not in any way morally obligated to save anyone because we deserve it. Again, this is a point upon which we can all agree.
However, God has obligated Himself, both morally and judicially, to save whosoever will come (believe). Not because they deserve it, but because He sent forth His Son to be a propitiation for sins of whole world, which is to be applied only through faith. His universal call to "every creature" to faith and repentance obligates him to save whosoever repents and believes. The doctrine that teaches that God only grants this ability to willingly repent and believe to a select few while appearing to call "every creature" is what causes the non-Calvinists to cry, "Foul!"
I don't believe the Calvinistic view of God is unjust because he condemns certain people to hell. I believe the Calvinistic view of God is unjust because He offers a pardon to all mankind while only granted a few of them the ability to receive it, all the while expressing a desire for all to come to repentance and a frustration for those who remain unwilling.
It is deceptive to offer someone a gift you fully know they cannot willingly receive. Especially if you, the giver, are the one who determines the receivers natural abilities. That type of offer cannot be genuine!"
Our understanding and belief of what is just is only "carnal" if its untrue and it certainly wouldn't be anything God would have to conform to as the author of it, thus this statement begs the question and thus serves no other purpose but to inflame.
More of the same...