These are apparently inflictions of the Creator himself. God is perfect. An aspect of perfectionis existence. Therefore God exists. These are just words.
Unicorns are perfect, therefore they exist.
The premise assumes that which needs verification. Saying it doesn't make it so. There must be heaven and hell in order for there to be justice in the long run. If God's justice resembles what we mean by justice - then the bestowel of infinite happiness for finite welldoing and infinite misery for finite illdoing is in no sense just. If the justice of God doesn't resemble what we mean then it is an abuse of language to use the name justice for it.