The People's Republic of China has proven to be much less of a threat to countries around the world than The United States of America has. They certainly don't have the track record of permanent war that we do.
Just because a country isn't on a civilizing mission doesn't mean it can't pose a threat. Certainly Africans upset with the Chinese gobbling up resources aren't happy. Countries on China's periphery can never be at peace with such a massive nation. You could argue that the way nations' economies are becoming so dependent on Chinese consumption means China's collapse would do substantial economic harm.
Border conflicts have always existed since modern China's creation. The most noticeable right now are Taiwan, Chinese migrants labouring in the Russian Far East, the South Sea stuff. But China's leaders know warfare is too costly, so the strategy is to settle in so long that the Chinese cannot be deplaced.
China also has to deal with interior conflicts in Xinjiang and Tibet - a colonization that has gone on for centuries. Maybe you would like to think one country is responsible for all the bad in the world, but that's just a perverse form of American exceptionalism, isn't it?
