Why do conspiracy theorists go against Jews all time?
Historic target among the Christian-influenced West? A ubiquitous subgroup, often barred from 'ordinary' society so adopting a stand-offish role (e.g. being the moneylenders when no decent Christian could be, and they are barred from most other guilds and professions by rule or general practice) in a self-reinforcing loop. Easy(ish) to identify both for in-group and out-group purposes and tar with the same brush when one of their number (
appears to) do something anathemeic to society.
But they don't even (generally) have the decency to be super-easy to identify (c.f. African heritage) so as well as the 'Goldberg Corporation' types (insert any yiddisher name you want here) there's the even more sneaky types who were so cunning as to have their
grandparents adopt a completely anglicised (or other non-anglic equivalent) decades before they were born so that they could pervade society in innocuous-looking but key administrative roles and further whatever common cause it is that they wish to further (including appointing 'their own kind' into other roles, that they had the deviousness to become the best-qualified candidate for!) and thus depriving any random boy from the sticks from becoming a lot more than the education and aptitudes granted to him, by his non-Jewish sticks-schtick upbringing, could ever hope for...
Recent Jewish immigrants (who may have been chucked/chased/forced out of some other regime's domain) are even worse, because they look a lot like pretty much everything that is all anyone really knows about their original homeland (and thus look like agents for that self-same regime they were escaping) with the accent and the looking like every other immigrant until they blend back into their new home again...
(I recon it's just a memetically evolved sweet-spot of prejudice, that gets re-adopted and reinforced whenever some other group (that isn't themselves a hotbed of perfidious judaism, with their matriarchal descendency and frankly odd refusal to proselytise!) wants to whip up anything from a minor grudge to a pogrom or full-on holocaust, not forgetting intra-semitic jihads and maybe other variations further around the cultural landscape.)
TL;DR; ...Haters gonna hate. And they don't need to have any imagination...
(I'm sure there's better sociological studies to explain this, but... from a not-in-that-out-group, but also not-in-the-opposing-in-group, perspective... this seems to cover the broadest of situations.)
Ninjaed - and it's no longer really Christians, but that probably got the ball rolling even among the more secular/neo-paganistic/whatever successor philosophical cultures.