It isn’t a problem at all, as I have tried to make clear. Evil is not substantial. It is merely an abstract concept.
Let’s start with God. Why is God good? What makes him good? Is he good because he knows what is good? That cannot be it, since it presupposes a higher authority than God, which thus means that God is neither the originator of all things or omnipotent. So again, what makes God good? The only answer left is this: God is good because he is omnipotent & the creator of all things, and therefore is of the highest authority. Whatever God wills, is therefore good.
Now let’s take angels and mankind, both of whom have consciousness, individuality, and their own wills. How then does evil come from them? The answer is simple, they have their own will. They don’t have to agree with God. This isn’t a defect. God wants a relationship with beings similar to him, in that these beings have wills of their own just like him. However, he wants their wills to work in conjunction with his. He wants a harmonious relationship. Evil isn’t substantial. Evil is merely having your will be contrary to God’s will.
Does God permit people and angels to have a contrary will to his? Evidently he does. So in some sense, yes God does will evil in the sense of permitting it. But that’s not the ultimate goal of his. His ultimate goal is to have an honest relationship with all of his creations that have consciousness, individuality, and free will. By its very nature, the set-up God has made will always permit others to go against him. If he wanted to make evil impossible, he would have to strip from each one of his angels and humans their free will. At which point, it wouldn’t be much of a relationship because we would all be like robots, and probably devoid of any creativity.