You're entirely ignoring davel's point. The reason the US bombs is because of what davel calls "Imperialism," and linked to examples of it. What you call "human nature Imperialism" and what davel calls "Imperialism as a stage in Capitalism" are fundamentally different concepts, you're talking past davel, and davel is 100% correct here.

The reason the US bombs countries is not because humans are mean. The US bombs to protect its interests. This you both agree on. However, davel has successfully identified why the US' interests depend on bombing others, and China's interests do not.

To simplifiy davel's point, Capitalism centralizes and spreads, until it spreads along international lines. This results in the country with more Capital leveraging this to gain favorable trade deals, so it can super-exploit foreign countries for super-profits. The bombing the US does is to keep their power projected and punish those turning against it.

China does not have a Capitalist system, it has a Socialist Market Economy. China manufactures the vast majority of its own goods, rather than manufacturing overseas, so its interactions with the Global South have a fundamentally different character. China wants to uplift the Global South so that the Global South buys from China and makes them even more money.

Both countries are acting in their own interests, but because of the structures in place, this results in the US bombing and plundering, and China building up infrastructure and hospitals. Even when China wants resources housed in the Global South, this difference in internal structure makes trade more mutually beneficial, rather than plunderous.