Because Jews have been hated on since forever. The reason? Jealousy and they're easy targets mainly because out of all the major religions, they are by far the smallest. It's kind of like picking on the small kid in the schoolyard.

Then there are the holy rollers who think the Jews were responsible for killing Jesus.

Assholes will say "becuz dey evil satan controlz the bankz and wurlduh!!!1!" But they're just being sheep who are trying be cool among the rest of the pitchfork haters.

Really though..it all comes down to religion. Religion is the one thing that has truly been the cause of all the bad shit that has gone wrong with humanity.