What I think you are saying is that God has no choice but to let man do evil. Is that correct?
No, I am not saying God has no choice. I am saying that we as mortals do not have a clear view into what God is doing in this world and that we shouldn’t assume He is not intervening just because we aren’t conscious of it. I am also saying the God allows us to experience the consequences of free will because it points us back to Him.