Sample argument: We learn from sociobiology that in the long run everything is largely genetic. Therefore a society must guard against various forms of improper mate selection. It must reverse trends where stupid and criminal people out-reproduce bright people of good character. The society that keeps its racial stock up over the long run while adaptively but selectively absorbing outside ideas will be rewarded by maintaining cultural vibrancy, technological innovativeness, and advanced economic and military power. Societies require a high degree of ethno-racial homogeneity to maintain their cohesion and competitiveness. They can achieve adequate intellectual diversity and innovativeness on their own without embracing racial or ethnic diversity. In fact, sustainable innovativeness is more genetic.than environmental. Frankly, some groups on this planet just do not make a contribution and a healthy society must make a strenuous effort to keep them out of its living space.
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Sample argument: The long term legacy of a society is measured by its ability to amalgamate the best ideas of various peoples and cultures around the planet. This process is aided by physically absorbing alien peoples as well as new ideas.The objective is to evolve a uniquely blended civilization, as well as maintain strong trade connections around the globe. This ability to continually absorb the best of different peoples and cultures requires a high degree of tolerance for diverse races and cultures. It is also very important for a society to show concern for the weak, the botched, the misbred, and the environment to promote general tolerance and ward off destructive forms of nativism and xenophobia. Cosmopolitanism is always preferable to provincialism and produces a more "sophisticated" (or "superior") cultural legacy. Prohibiting a free flow of people as well as ideas overly constricts labor markets and creates other undesirable constraints that impair creative personal expression. This can also inhibit minorities who make unique contributions.