C. S. Lewis in 1917, left, with friend Earnest Moore during World War I. Moore would later be killed, as were many of Lewis’ friends. (wilsonstation.com)
If God thinks this state of war in the universe a price worth paying for free will then we may take that it is worth paying.
The very idea of freedom presupposes some objective moral law which overarches rulers and ruled alike. Unless we return to the crude and nursery-like belief in objective values, we perish.
The lost enjoy forever the horrible freedom they have demanded.
If a thing is free to be good it is also free to be bad. And free will is what has made evil possible. Why, then, did God give them free will? Because free will, though it makes evil possible, is also the only thing that makes possible any love or goodness or joy worth having.