It's just genetics. In the same way black people have behavioral tendencies to behave certain way, so too do the race of jews. Keep in mind jews are a race. When people speak of "jews" they don't typically mean the religious jews, they mean the Ashkenazi Jews, which are a race. They look white but their genetics is more "middle-eastern" with some black genetics in them. There are significant physiological differences between them and whites, such as for example the fact they are significantly more lactose intolerant than white people and their physical appearance is noticeable (nose, hair, etc...).

Jews happen to be highly gynocentric, whereas white people are patriarchal. Jews have a predisposition toward favoring activities that one could call "scamming", whereas whites value "truth" significantly more than jews. Lastly, jews prefer activities that have little physical involvement, whereas whites tend to excel much more at anything involving physical activity. These behavioral differences lead to huge issues in society when jews run the society but the society is mainly made up of whites. This is further exasperated because jews are among some of the biggest racial supremacists of any race.

If you wish to read more about the gynocentric aspect of jews, a book I often recommend is Sex and Character: An Investigation of Fundamental Principles by Weininger, Otto

Otto Weininger is a jewish person himself who writes about the feminine characteristics of the jewish race. In modern society this is some of the most pertinent differences that are negatively impacting white people. That's because a lot of the biggest problems facing white people stem from jews changing society around to be gynocentric which is what jewish people prefer because that's what their nature is. This nature is directly opposed to white people's nature though, both men and women. That's one of the main reasons why white men and women are doing terrible in modern society.

It's not that jews are demons, it's just that their genetics are that different from white people's genetics with regards to behaviors predispositions. That's also why not all jews are the same because there's always variance among any population but overall, as a whole group, they have behaviors as described above which, when combined with the fact jews pretty much run western society, it leads to terrible outcomes for white people and makes white people think jews might be demons. It's just because jewish nature is not compatible with white nature.