> Perhaps if you create entities with free will they will unavoidably though ignorance or malice do some evil to a lesser to greater extent and therefore cause misery.

Well, to be sure, you have to nudge a bit and create such circumstances to make sure there will be misery and wars. For starters start several opposing religious factions, all willing to do god's bidding and do horrible things in his name. Don't discourage it, leave your words in ancient manuscripts open to interpretation.