Why can't the all-powerful, all-knowing creator of everything, contain an absence? Didn't God created all things? Wouldn't that include both good and evil? Why assign human traits and logic to God?
In answer to your first question--When we say God created all things, we mean he created beings to exist. But evil is the non-existence of something. It is a negative concept, an absence, a void, a lack. When goodness is lacking, we say something is evil, since the goodness that ought to be present in something, doesn't exist in it. But since God is Existence Itself--which means all Goodness itself--He can lack nothing. There can therefore be no evil in Him.
In answer to your question about assigning human traits and logic to God, I have done just the opposite. Look at my post. I said God was not subject to our notions of right and wrong. As Creator He transcends morality. It is you who ascribe human traits to Him by asking why he permits the evils that occur--such as the Holocaust, etc., as if He is wrong to allow them. But since He is of a different order of Being from us, His ways are not our ways. We simply don't comprehend the divine arithmetic. So you are asking the wrong question.