First: get rid of your word, “omnibenevolent.” That is sloppy theology. The word is not found in Catholic sources. It was coined by atheists attempting to develop the Argument from Evil against the logical coherence of the existence of an all-good God while there is evil in the world.
God is all good, not “omnibenvolent.” Benevolence is good will, and “omnibenevolence” would imply that God extends good will to all, including the souls in hell. And He does not. The souls in hell do not enjoy God’s goodness; they are entirely deprived of it. They suffer His Justice only, and not as their justification, since they have rejected that, but only as their eternal punishment. Punishment is precisely the evil that God creates, referenced in Isaiah, “I form the light and cause darkness, I make peace and create evil; I, the Lord, do all these things.” So since God inflicts the evil of punishment for all eternity on the souls in hell, plainly, He cannot be called “omnibenvolent.”
Not so. God is in fact omnipresent. We know that He is even in hell, in His Justice. But a will is not a location, and a will is not even a complete essence, a will is only one aspect of a being. There are beings with wills; there are not any wills existing independently of beings who have wills. So God is present to the being who wills evil, specifically as That to which their wills are opposed. Evil has no reality apart from the opposition to or negation of good, and that good to which the evil is opposed, is from God, and ultimately, is God.
It is well to reflect on current events. They are Apocalyptic in fact.
It is accurate to say there is no “such thing” as evil. Evil has no substance. There is no evil created thing. Genesis says that God beheld His whole Creation, and saw that it was good. Now the Tree of the Knowledge of Good and Evil was created by God, and therefore was good. The Serpent was created by God, and therefore was good. But the Serpent willed the evil of Adam and Eve’s transgression of God’s Commandment. The will of the Serpent was evil; but that will is not a complete substance, but only an aspect of the created being, the Serpent. So there is no created substance that can be called evil; but evil manifests as an undesirable configuration of created substances. Any substance put to a use that is contrary to God’s Commandment, is used for evil.