In fact Herzl published Der Judenstaat as a response to what he witnessed covering the Dreyfus Affair as a journalist.
Assuming that OP hasn't been around for thousands of years himself, I could only point out modern day antisemitism which makes perfect sense. OP never asked for a complete history.
However, if you're going to get to the root of things, you'd have to bring up religious prejudices passed down through the centuries as well as the origin of money lending and banking which undoubtedly cast Jews in a bad light.
This documentary had some good examples as well as an overall interesting view of money itself: http://en.wikipedia.org/wiki/The_Ascent_of_Money
Edit: And this is now getting downvoted why? What the hell is going on here?
But even if that were the case, you're making a pretty ridiculos argument:
1) Antisemitism has been around for a thousand years, before certain organizations existed.
2) Antisemitism is still around now.
3) Now it makes sense, because those organizations exist.
Whereas it makes a lot more sense that these organizations are an excuse for antisemitism, not the cause. After all, antisemitism has been around non-stop for thousands of years, there's no reason to think that it would have stopped had these organizations not existed.
Edit: HN has turned into Reddit. Ghostdownvoters, downvotes without explanation. Oy vey!
Not sure how my points weren't completely relevant. They were.
Either I made some sense (pointing out that AIPAC or Zionism could be a reason for hatred) or these guys just showed up in the thread:
You obviously don't understand how the HN discussion system is supposed to work, and you've been hellbanned to boot (which is why I am responding to you here), so you might as well just stop.
http://en.wikipedia.org/wiki/Israel_lobby_in_the_United_Stat...