Why should I rate comments?
Your ability to rate other people's comments is integral to your participation. Civil's algorithms work behind the scenes to cross-check your ratings against those from other users; if you aren't rating accurately, you risk your own comments not being published.
Plus, it's fun, and it helps make the comments a lot more interesting. Everyone's tired of the old "ur a moron" comments. With Civil, you have the ability to help build one of the best comment communities online.