Exactly. China has never opposed a strong, healthy and positive US. It's the US that's getting increasingly poisonous over China, to maintain its hegemony. A change of political mindset could really see the world with two great countries with different but competitive systems that could learn from each other and see each other's shortcomings.
Political proselytism. Certain advocates for democracy believe that democracy and autocracy cannot coexist in the same world and autocracies must be toppled wherever they appear.
Honestly I'm seeing parallels with the christian crusades. Remember that religion and politics were historically one and the same.
China needs structural reform before it can exist harmoniously with the US and the rest of the advanced economies. The gap is just too big in terms of civil liberties and rule of law.