selfishness and cruelty makes the world a better place, not a worse one.
the problems of the world today come from the opposites: altruism and kindness.
thats the source of the twin scourges that made the world a sucky and boring place to be in:
dysgenics and egalitarianism (equality, equity, fairness inclusivity, diversity, tolerance, etc.)
dysgenics is by far the worst offender: the quality of human existence comes down to the quality of humans.
whenever you do anything that impacts society, such as passing any public policy, you influence population demographics through introducing or removing or altering the factors which select for any given set of traits.
eugenics is simply keeping this in mind and considering it as being important, and it should be considered the most important factor in deciding what policies shouod be in place.
civilization has made it so that the traditional factors of natural selection no longer provide a significant impact on human evolution, instead its sexual selection and public policy. politics and econonics are now what drive the success or failure of humans to reproduce, and of human genes to propagate themselves by having copies of themselves be used in the creation of new organisms.