Why hasn’t West Taiwan gone to war over Taiwan and the South China Sea? Because they are a Paper Tiger and know they would be embarrassed by the US Navy. That’s why the US shows up to every “minor dispute”, to keep the peace and support their allies. Additionally, China has recently been extremely belligerent concerning the border with India, which is a continuation of what has been happening since the 1960’s.
Historically, you’ve also forgotten the CCPs military actions against Tibet, Vietnam, Cambodia, South Korea, and the many border conflicts with Russia/USSR.
As for genocides, it is very convenient for you to forget about the Uyghurs…