On the contrary, if God condemned every person in the world to hell, He would be entirely just, because all men have sinned (Romans 3:23). What He would not be is merciful.
If even one person is saved, God is merciful, because that person is receiving mercy.
However, we know that there is a vast crowd of people, so huge that no one can number it, that will be saved (Revelation 7:9). So we praise God for His wonderful mercy and grace, which is what the Bible does regularly.
What I would like is for Agent 47 to tell us whether he thinks that crowd would get bigger or smaller if
a. Man had free will (whatever that may be).
b. If there were not Irresistible Grace.
And why he thinks so.
Even if just, still sadistic.