"flagged" always means that users flagged it, not moderator action.
And there are a lot of readers who will flag all submissions about US politics, no matter the polarity of the article.
so when you [@user] tag a user rather than email its kinda like a rhetorical question, your not expecting a reply, but if someone just happens to pass by and notice your tag, they might answer.
also @user might mean wasted desire to some, but other users here might see a previously agreed upon heuristic is in play, and act in that context.
for example if someone from a very small subset of usernames that i recognize, were to @rolph me, i might SMS them at a previously agreed mobile number, if i see the signal in a reasonable time.