The "Two sides" you're spotting is US posters vs non US posters. It's not exactly a secret that the US has long had a propaganda process going against China with their own citizens. From the outside it's weird how 'cult like' some parts of the US education system come across with things like this. It's similar to the whole socialism = communism = bad fear embedded into US society.

The US obviously isn't the only one guilty of this kind of thing, it just happens to have been one of the most effective.