They’ve also engaged in widespread campaigns of asymmetric warfare against other countries. Lots of cyberattacks. Theft of intellectual property - corporate espionage but also copies of designs and hacks of government agencies. Unfair protectionism in their own markets. Lots more to list.
But mostly because the CCP just can’t be trusted with their power, because they’re neither democratic nor support liberal values like free speech. I think there’s a lot to admire about China and Chinese citizens. But their government is ultimately a threat to the world order and the progress of liberalism.