We know that Russian troll farms amplified political divisions in 2016 and 2020 in order to make the US less cohesive; the intent was to weaken our home support against Russia’s planned in vasion of Ukraine. While I don’t think that China has any similar intentions, anything that makes the US less cohesive makes it harder for us to assist our regional allies in resisting their imperialism. So you do the same thing: amplify the most extreme voices.