Even if that's true, and the writer was advancing a hidden, more devious agenda, I still think its likely that the best course of action is to engage it as if it were advanced in good faith, in a fair, reasonable way.

Encouraging immediate, unthinking, righteous and moralistic condemnation over rational discourse on issues close to the friction points of various cultural/ideological conflicts, is quite a dangerous thing to do, even if its satisfying and cathartic (that's precisely why its so damn dangerous).