Surely God can save everyone.
Surely God have free will to do anything He pleases.
For all that the Lord does is not bound by sin nor temptation.
The ability to executed judgement unconditionally is God's right.
Strip off God's ability to executed judgement unconditionally and you have strip off God's ability to show mercy.
Strip off God's ability to show mercy and you have strip off God's agape love.
The agape love of God is unconditional.
We are save by grace because of the agape love of God.
God is Just and there can be no doubt about it.
No one is good except God alone.
No body has ever been a victim of injustice in the hands of God.
When God unconditionally sent someone to hell, He is only right.
And if God have mercy upon whom He will have mercy, the agape love of God is demonstrated.
Surely God can save everyone. But the right to show mercy to whom He will show mercy is solely His.
To take that right from Him is to usurp His throne and a great blasphemy.
To submit to God's authority is to worship Him; an ascribing of worth to His Lordship.
Romans 9:15-16 KJV
For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion. So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy.