You just dont want to reason.
God is not cruel as to close their mind BEFORE they have made that choice.
You have a wrong God in mind kid.
I have explained elsewhere that God gives you a chance after chance before He kicks your ass.
He is a just God.
Yes he does, you know why? because everything is M'katub (written and predestined) which means from the moment that person was a bunch of cells in it's mothers womb, there was a book detailing exactly what it's life would turn out like, even down to whether that person is going to end up in hell or not.
That is cruel beyond belief, what selfish self absorbed individual you are to not see the inherent cruelty in such measures.
He seals their heart and mind when we mere humans know that nothing is concrete or set in stone, and a person could change course at any stage of their life.
It's a retarded god who would lay out this kind of self defeating self fulfilling prophecy.