Ask Tibetens about that. The US left Iraq but the CCP still controls Tibet and oppresss native Tibetans. Or the Uyghurs that the CCP are brutally persecuting. Or the Falun Gong. The CCP also is a strong ally of the despicable North Korean government and sends North Koreans in China back to North Korea to face long prison sentences or execution.
The CCP is very evil at violating individual human rights. And smart people defending their behavior is very odd