Also it seems strange that a parasite would be able to reproduce with it's host while producing Hybrid offspring containing a mixture of their DNA and the host DNA

For example Misquitos Tics, Tapeworms, Hookwoms and so on do not such thing

Some parasites need their host to reproduce but do not merge DNA with their hosts

I know of no other Parasites that merge their DNA with the host when reproducing

So I would suggest that they are taught to be parasites culturally & it is not genetic

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I would say that of the races you mentioned, only the Jews are biologically parasites. I suggest you look up adelphoparasites, who are parasites closely related to their hosts and in some cases able to interbreed with them. This sort of parasite ethnicity has evolved before among humans (see the Gypsies and Irish Travelers, for example), but never has any been as dangerous as the Jews.