Why may China never be able to become a democratic country and be really civilized, considering that the residents on that land have been selected to survive after endless tyrannies by slaughtering the individuals who ever dared to protest and rebel?

China may remain authoritarian for a long time, but there is little basis for concluding that Chinese people have been biologically “selected” to be incapable of democracy. The more convincing explanation is about institutions, incentives, and the lasting effects of repression—not an inherent defect in the population.

Your question does point to a real mechanism: tyranny can make resistance harder across generations. Killing or imprisoning dissidents removes organizers, breaks networks, and teaches families that political participation is dangerous. Censorship can erase knowledge of earlier movements. People may then appear politically passive even when they privately oppose the government.

But several distinctions matter:

• Repression is not evidence of genetic selection for obedience. Political resistance is not a simple inherited trait. Whether someone protests depends heavily on circumstances, beliefs, resources, social connections, and expectations about whether others will join. Historical evidence does not establish that centuries of repression have made a population biologically unable to govern itself democratically.
• Silence does not necessarily mean consent. When dissent can cost someone their job, freedom, or family’s security, remaining quiet can be a rational response. The same person may behave very differently under credible legal protections.
• Chinese history is not a history of resistance disappearing. It includes repeated rebellions, reform movements, labor activism, the 1989 democracy movement, and more recent protests. Those movements had different aims—not all were democratic—but their existence contradicts the idea that the capacity to resist has been eliminated.
• Taiwan is a strong counterexample to cultural or ancestral inevitability. A predominantly ethnically Chinese society moved from authoritarian rule to competitive democracy. Its circumstances differ substantially from mainland China’s, so it is not a prediction of the mainland’s future. But it does show that Chinese ancestry and cultural traditions are compatible with democracy.

There are, however, substantial reasons why democratization in mainland China is difficult: the Communist Party’s control over the military and security services; censorship and surveillance; restrictions on independent organizing; elites’ incentives to preserve the system; and fear that political upheaval could bring disorder. Nationalism and genuine support for aspects of the government also matter. Economic development alone does not automatically overcome these barriers.

I would also separate democracy from being “civilized.” If by “civilized” you mean accountable government, protection against arbitrary violence, and respect for individual rights, those are specific standards we can assess. Calling an entire population uncivilized instead conflates the conduct of a state with the worth and character of its people.

So the defensible conclusion is not “China can never become democratic,” but: long-standing repression can destroy the organizations, trust, and protections democracy needs. That can make democratization exceptionally difficult without making it impossible—or making the population inherently unfit for it.