They are creditors for millennia, as the Christian and Muslim religion prohibited to lend money for interest.
So, besides they were good traders and supported each other intenslely, they became rich by making others work for them.
If you owe them money, you don't fight vehement for their rights or against their abuse. You get even rid of your debts by actively support their disappearance.
Additionally they keep some distance to the local communities, they have their own religion, their own prejudices, stange rites, different appearance and hats - and their girls are pretty good protected while non jewish girls are shiksas.
And some try to gain control like any other people with enough money and are disliked accordingly.
Oh - and the actual zionist apartheid system in Israel doesn't do them any favour.
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