Why do stars clearly genetically modify and regenerate old species?

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How do stars purify species? The first is the most direct and violent way of genocide cleansing. We should first formulate policies to allow purification, and then turn civil rights into persona non grata. We must also build an all-round army. Then it can be purified. But this purification is tantamount to genocide. Click on it and purify everything. Not even one of them is alive. The second is the inhuman gene blockade cleaning method. The policy chooses slavery, then forbids slaves to have children, then the whole race immigrates, and then carries out genetic manipulation. After modifying the gene, the population will die in turn until the end of life, one by one. In the end, there was no one left. To put it bluntly, all races were castrated and then extinct without new members.