The everlasting Lake of Fire was made for the fallen angels and it also involves punishment.
A better perspective is to consider the life of God and believers.
Should God have to endure their evil in His presence for eternity future, or those whom He has paid the price for, so that we might live with Him for all eternity future, should we have to eternally endure their evil?
It has been said that humanity is the appeals trial for all the fallen angels. They’ve already been condemned. This age is to show all of Creation that His judgment is not only righteous, but full of grace.
I understand your point.
But it makes me wonder: If the sinner’s soul is sent to Hell to keep them from being in God’s presence, why not just destroy them?
Or is the soul “un-destroyable?”
I am not intentionally trying to be difficult, but why wouldn’t God just toss them in the garbage and be done with them.