I think American interests are served when there are sections of the world that have representative governments, politically open economic systems, and are willing to take a stand against some of the more extreme ideologies that there are around the world.
As is often the case when things are complicated, extreme views have superficial appeal. On the one extreme, some see China as an inevitable enemy that must be contained; on the other hand, there are those who see China as a slowly developing democracy that can be embraced.