Sure, but they do the "promoting polarity" thing outside the US plenty. It's a useful tactic; pick wedge issues like gay people or immigrants, spread false or out-of-context news, etc.
For a nice Baltic example, Lithuania: https://www.thedailybeast.com/the-baltic-elves-taking-on-pro...
> Facebook is where the light skirmishes take place; the mortal combat is reserved for the comment sections of Lithuanian news articles, where the trolls loose a constant drizzle of falsehoods and complaints, each comment helping to construct an alternate reality version of life in this Baltic country of 3 million. Rather than a thriving and patriotic post-Soviet success story, which it is, the image the trolls cultivate is that of a demoralized and angry society whose people are ready for regime change, be it through internal democratic mechanisms or through “liberation” by a friendly neighboring army.
