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There are certain things that raise a red "conspiracy theory" flag - use of language, faulty linkages, misrepresentations, etc and honestly - these arguments seem full of it. It's not a matter of thinking outside the box - it's a matter of logic.
You are assuming that the Wiki info is correct, but it is merely supposition. Look, if you are not interested in a different point of view, that's one thing. But shunning it out of whole cloth is silly.
If Wiki were my only source, you would have a point, but it's not. I remember my history classes, and I read a lot. I know how to look for original sources - and, wiki links to a good many sources as well.
I'm interested in different points of view - but I don't take seriously arguments that aren't well founded. I just gave one example with the cyanide claim. There are probably countless others that are as easily refuted.
So according to you, anti-semtism exists because people just hate Jews. Jews have had problems since time began, just because it's fun to be mean to Jews. That's what we are left with, and frankly it's myopic and delusional.
According to me? You've never asked me my opinion on this so you don't know what I think.
Anti-semitism exists for the same reasons Islamophobia, racism, ethnic bigotry, you name it. There are a lot of reasons. People fear what they don't understand, and that fear leads to a ready belief in conspiracy theories and misinformation and a tendancy to scapegoat. Have a scapegoat unites people as well under one cause, however misbegoten. Scapegoats can be blamed for economic woes, bad situations, cultural decadence - whatever you want. It doesn't have to be true it just has to sound "plausible". If the scapegoats give the appearence of benefiting economically - even better.
I think it's important to note that scapegoats are usually a minority, yet they get blamed for everything way out of proportion to numbers.