Granted, it's described as a "simple" parable. But the big problem with this little parable is it's implication that God does the "twisting" of the disabled. I struggle with this. I don't struggle at all with the notion that God brings good out of all situations, but I struggle with the notion that all bad situations are God's will.
To go back to the beginning, I don't think anyone would argue that it was God's will that Adam and Eve disobey Him.