Jew Subversion Studies Program Jewish Aims in Destroying White Societies.
The answer of course is that people calling themselves 'Jews' seem to have had disastrous effects. In the same way that the discovery of oxygen explained fire, rust, corrosion, breathing, calories in food, paper turning brown, and how fish live under water, Jews can be studied, and must be, to understand the world as it is now.
Although study of Jews is yet another time-consuming subject, and at present is an aspect of home-schooling, once it is mastered it gives a much more accurate and simplified view of the world than without it. At present, many people, unthinkingly, imagine that discussing Jewish influence is not important.
They can be man-made, as in breeds of dogs and cats, both of which are races of one species.
Note for people worried about evolution: it's not necessary to believe the full theory of evolution; species date back so far that their beginnings are in the far, far remote past.
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