I suppose I know it then. Evil to me is a lack of goodness, God causing evil = God removing a good from something or not giving it to something (really just two ways of saying the same thing there). When a person does He takes away the gift of living from them, or rather stops giving it to them, and they die. Same for when someone gets sick, He stops giving them wholeness and sickness ensues. In Isaiah it's speaking about that in a larger scale, when He removes unity and prosperity and victory from a society calamity, apocalypse, etc, will ensue (this kind of evil is spoken of a lot in Scripture). That's what my idea of it is. That's why I said it is right to say God doesn't "make" evil in one sense, like He made the Earth (brought it into being), but it is right to say He "makes" it in another sense, for whenever you see evil you see a removal of a good not a "bringing-into-being," or a lack of one.
We also can do this and participate in it. From there it gets more complex and is beyond my knowledge right now.
