It may be more educational to contest one that most readers might not realize is problematic (I didn't bat an eye) than one that is obviously flamebait.
I've done that at least 40,000 times. This isn't a linear ordering!
There are many principles, which we're discovering together, around curious conversation. I went into this one in detail because I think it's interesting.
Btw, if you see a post that ought to have been moderated but hasn't been—for example, a "worthless, flame-inducing" one—the likeliest explanation is that we didn't see it. You can help by flagging it or emailing us at hn@ycombinator.com.