Yes, that is the review process we go through to comment. The three comments we see are determined by random chance, not by topic, author of the comment, or social psychology. The idea is you take a step back, look at some other random comment in another thread (with a click available to catch context), and rate that one as civil, or not. 

I don't know about social engineering, that may be a bit too grandiose. I think of it as all of us pitching in to moderate, instead of depending on one person, or some software to screen words and phrases. We each spend our 10 second, and the system works better. I hope.