Dang isn't Chinese (his username is not a romanization of 党, but short for Daniel Gackle), but as you say he occasionally takes threads off the front page. Usually because he thinks they'll only lead to repetitions of the same old flamewars instead of significant new discussion.

There's no reason to suppose that a majority of people participating in China-related threads and voting (in either direction) on comments is Chinese. It's likely that they have some strong opinions on the topic, but ethnicity is neither necessary nor sufficient to develop such opinions.