Interesting... but other than that there was a big spike around Civ5's release, I'm not sure quite what to draw from it.
I do have some (controversial) statistics on forum activity that I've collected over the years via both direct observation and help from the Wayback Machine. They aren't great, since they aren't divided into nice, even time intervals like the infraction stats, and only include forums that are visible to me. Someone with database access could do a lot better. But for those intrepid souls who do wish to evaluate based on the available data, I've attached it. The "CFC" tab is cumulative traffic; the "Trend" tab is traffic per year since the last collection time (normalized based on how many days since the last collection time).
Unfortunately, the time period around the Civ5 release is one of the more sparse ones in my data. So I can't reliably say if October, 2010 had that much more traffic that the spike in reports and infractions can be expected.
I do recall a lot of flamewars about why Civ5 was worse than Civ4, though, and more than a few infractions in those threads. Anecdotally based on that, I'd suspect that did increase reports, but the spike in infractions + warnings (no spambots) is pretty severe.