I think there's a big difference between something like a corporate campaign or voting ring where a bunch of comments show up to boost a product, and a case like the one I described where many people showed up organically to express an alternate point of view. For one thing, in the second case there is something to learn.

In general, though, you're right that users here should be using the site as intended, and that means not using it primarily for arguing about politics or nation.