Fascinating response from Mosaic.
I think that it is an integral part of cultural identity that people tend to distrust and fear people who are inherently different in their customs, dress, language and so on. A minority culture will naturally band together because it is more comfortable to live and work alongside others who share your language and customs. This naturally leads to an element of ghettoisation, whether intentional or not, which exacerbates tensions.
This thread runs thorughout the world, with cultural attitudes shifting and developing as time moves forward.
In Elizabethan times in England, the Jews were seen as people to be reviled and mistrusted - hence the personna of Shylock in The Merchant Of Venice, vengeful and thwarted in equal measure, which would chime with society attitudes of that time.
Various cultures have held the view that Jews are responsible for the wider financial travails in the world - most noteably of course Hitler with his Final Solution which encompassed other races and genetic groupings seen as unfit to continue alongside the Ayrian future.
As Mosaic has mentioned, persecution of minorities is by no means exclusively a feature of the Jewish experience, but is an occuptational hazard in any society or culture where a majority exists which, by default means that minorities also exist, which can lead to one seeking superiority over the other, which is a sad reflection of human nature.