Joe takes a child, ties a rope around its waist, and hangs it over a cliff.

Bob says, "Dude! You can't do that! Pull that kid back up."

Steve says, "I've been telling you from the beginning they shouldn't be hanging kids off a cliff. Now you want to keep holding on to the rope. If you really thought it was wrong you'd untie the rope right now. You're part of the problem."