Well the fundamental reason for this contradiction is the fact that the jewish denomination is both a religious and an ethnic denomination at the same time. Religious Jews are fine, and secular jews are for the most part also fine, but there's a portion of secular jews that are fucking evil, the same way that a portion of any race is fucking evil.
The problem is that jews are on average smarter than us by at least a standard deviation, which means that on one hand they disproportionately dominate the sciences and other high IQ professions that help advance humanity but on the other it also means that the most intelligent and efficient evil fuckers out there tend to disproportionately be jewish.
Hitler intended to make a superior race, and he fucking succeeded, just not in the way he expected. He applied immense selective pressure on a single population and the smart survived, either by seeing it coming or outwitting their pursuers.
If you want to label me I'd prefer the term ubersemitist, since I do in fact believe them to be the superior race. Followed closely by some East Asian ethnic groups. And when I'm referring to jews I'm mostly talking about Ashkenazi Jews.