I don't think you quite realize how much craziness is in the world at large. There are have been instances of pizzagate levels of craziness in my home country, as well as in the other countries whose news I follow.
You also don't seem to grasp how discussions on the Internet work. People will post about things that interest them. Telling people not to post things that are of interest to them because you don't like it is counterintuitive and borderline offensive. I told you the reason you're seeing much more US-centric posts. You have quite a lot of options if you don't want to see that stuff, but telling everyone else not to post it is not one of those options.