Welcome to the click minister.

I mean, to answer your question. Good without free will isn't good...it's just a set of instructions that everyone abides by because there's nothing else to choose.
So it can be argued that evil came about as a consequence of creation, like a penalty of sorts. It's like creating a coin, no matter how you create it it'll have two sides. Even if you only work on one side of the coin, the other side blank as it is, will still be a side as well.
Maybe God didn't create the tree itself, but the tree blossomed as a result of his creation. Creating light without creating shadow, perhaps it is possible, but then...what kind of light are you trying to create if it has no shadow? Is light without shadow as beautiful as light that casts forth shadows?
Now, as to why God chose to create beings capable as us knowing that it would be like that. Your guess is as good as mine.