Have you noticed how the Jewish race, despite persecution never moan nor blame others for their misfortunes?

Even though the Jewish people have been persecuted for centuries culminating in the horrors of the holocaust I have never heard them making one derogatory statement against their persecutors. Instead they simply apply themselves and make a success of almost everything they set out to achieve and always contribute positively to the society in which they live. Why can't other groups adopt the same positive frame of mind and stop blaming their failures in life on historical events such as slavery.