It seems to me that God created beings capable with the ability to express love, at least to a certain degree, whatever that degree is. And that for this expression of love exist, one must necessarily have an equal amount of room for sin. In other words, one must be capable of sinning to at least the same degree he is capable of loving. I have a question. If one chooses to have a child, is the parent responsible for the child's sin? What about when the child is an adult...is the procreator/parent responsible?
He wouldn't know the future as fact/definite.Also you noted he may have known or that it may have not entered his mind how low man would go... with those statements how could one say that God knows the future?