The reason for antisemtism...

Anti-semitism is historically European-Christian. Anti-semitism doesn't really exist in the far-East, the Indian Sub-continant, Africa, Central Asia, it wasn't an issue in the Islamic world either untill 60 years ago.

What are the roots of this? well the fact that Jews have been made historic scapegoats, "traitors", "prophet killers" doesn't help. Ever since the Byzantines, Judaism has been on the sharp end of its official policies.

As it was a theocratic era, this religous dislike for Jews manifested into tradditions and culture.

In addition to this, as the Church disliked Catholics handling money and interest, Jews were used to do this instead, hence the "Jews are greedy money-grabber" stories.

Also as Jews remained Jews and didn't assimilate this caused mistrust as they kept tight nit socities to keep their religion and culture alive.

Now add that Jews were blamed for the "plague", they used to be accused of killing and drinking little kids bloods, then the endless list of "Blood Libels", the constant expulsions and so on.

The Nazi ideology wasn't really anything new, Jews were historically blamed for most things undesirable in the region.

What is ironic today is that, it was the Islamic world which historically gave equality, freedom, tolerance and protection to Jews. They outlawed Blood Libels, built synagogues, welcomned the constant expulsions into their lands, even Suleyman the Magnificent wrote a letter to the Pope telling them to stop persecuting Jews.

However, look at today, Jews are having a tougher time at the hands of muslims. Although Israel hasn't exactly treated the Palestinians very well either.