We keep arguing over our discoveries, theories, inventions and ideas. We argue, because we cannot possibly agree on anything as perfectly alright.
In a way, we are better than God in this context, because we have the experience of imperfection while God does not have it directly. God has to gain the experience of imperfection from us.
God desires that all those imperfect evolutionary beings like us gradually mature to attain perfection through life experiences and become true sons and daughters of God who are fully willing to live according to the will of God.
Learning by experimentation and experience is better than learning by other means. We learn the comparative desirability of beauty when we are able to recognize ugliness. We understand the desirability of good when evil also is experienced.
Evil is a potential outcome of the imperfections of free-willed beings like we humans. God does not cause evil nor He likes evil.
Because of our misunderstandings arising out of our present imperfections, there is a possibility that we may attribute good and evil both as a result of God's will.
If I say that is not the case, all of us are not going to agree anyway.
Because, there are many among us for whom two plus two is not four, yet. Till every one attains the peak practical level of knowledge and maturity, our problems of our own make, arising out of our misunderstandings will remain. And we keep on experiencing the contrasts of good and evil to conclude the desirability of good over evil, perhaps at some distant future!