What's the true purpose of the mole?
To have fun, first and foremost. There would be no need for moles if DU had similar free speech policies to those it claimed George Bush got rid of.
The greatest use of the mole, in my estimation, is to
flush out the DUmmies. To get them to own up to silly opinions, conspiracies, and so forth. All it takes is the subtlest of pushes, and the angle of repose steepens. From that point, much hilarity ensues, and maybe, if you're crafty, you can get two DUmmies to go to war with each other.
As someone who has stirred that pot several times, I recommend it with great relish.