What's a good way to respond to those flutherites who get deeply angry and rude about the moderation system?

As you veteran jellies may have noticed, there seem to be a fair number of newer flutherites who don’t like the moderation system and say some pretty petty/mean/nasty/etc. things about the moderation system. What’s a good way to respond to these people?

Please note: I said “good” not “polite.”