Well my first reaction to that is one of amazed disbelief. Personal attacks and flamewars are usually bleeding obvious, and equally easy to avoid.
With it having been there a while, I can't think of any specific comments one way or another, but was and have always intended to use it to rescue (typically) a comment making a good point to the discussion, or the question I'd be interested in an answer to as well.
So I can't imagine how I crossed whatever line. I generally agree wth the tone of moderation here, and degree of leeway usually given. I think my comment history would bear out in tone and style that I'm using as intended, and I don't recall ever having had a mod pick up any of my comments. :p I disagree with the odd rare one - this is hard to generalise without going away to dig for examples - usually where it seems to get a slap on the wrist for a reasonable, or historically accurate point within the flow of a discussion where the complaint of nationalistic or whatever seems a bit of a stretch.
Case in point, the guy posting links that seemed to be reliably going on every climate related topic - I'd have said nowt for one or two, but had seen enough, like on every related post I'd read in a couple of days, that I thought it would have been missed by mods and worth a mention. Others trigger much sooner than I.
Make of that as you will. :)