Know that you must judge all people favorably. This applies even to the worst of people. You must search until you find some little bit of good in them. In that good place inside them, they are not bad! If you can just find this little bit of good and judge them favorably, you really can elevate them and swing the scales of judgment in their favor. This way you can bring them back to God.
Rebbe Nachman, Likutey Moharan I:282