https://responsiblestatecraft.org/china-cold-war-2669160202/
Nice to see your hard earned tax dollars are going towards such a fabulous cause. Meanwhile I've heard it said that Chinese and Russian bots exploit divisions in the Western world by talking about things like poverty, homelessness, gun violence, racism and sexism. Well maybe you should start doing something about those issues to stop them being used as fuel for alleged foreign propaganda efforts hmmm?
Thing is that the internet is a global phenomenon, and we don't see the same thing happening in all the countries. So, the internet itself clearly cannot be the explanation here. There are specific issues present in the US society that we see manifesting as political polarization. I do agree with you that the internet makes it easier for ideas to spread, and thus it acts as an accelerant. However, there need to be underlying divisions to accelerate in the first place.