Because they are milking it. Whatever gets them what they want most effectively. Whatever makes them feel good - true or not. It's sort of like in Australia - if you are one eighth Aborigine you call yourself an Aborigine - it gives you lots of social perks.
Then why do Jews often refer to themselves as ethnically Jewish? On Wikipedia you will find this quite often. And Wikipedia is owned by a jew. Here is an example of the scumbag that gave Michael Vick a $100 million contract while still sitting in prison for torturing dogs:http://en.wikipedia.org/wiki/Jeffrey_Lurie
In 1992, Lurie married Lori Cristina Weiss in Gstaad, Switzerland. They had two children: a son and a daughter. Weiss was born in Mexico City and has dual citizenship in Mexico and the United States. She speaks three languages fluently: Spanish, French (her mother's native tongue), and English; she also speaks passable German and Italian. She is ethnically Jewish but was raised non-religious.
She feels closest to Buddhism. The Luries celebrate Passover and exchange presents with their children on Christmas. She was instrumental in changing the Eagles' colors from the traditional kelly green and recreating the logo. In 2012, the couple announced that they were divorcing.
Mike Wallace: Black history month you find ridiculous. Why?
Morgan Freeman: Youíre going to relegate my history to a month?
Mike Wallace: Oh, címon.
Morgan Freeman: What do you do with yours? Which month is white history month? Well, címon, tell me.
Mike Wallace: Iím Jewish.
Morgan Freeman: OK, which month is Jewish history month?
Mike Wallace: There isnít one.
Morgan Freeman: Oh, oh. Why not? Do you want one?
Morgan Freeman: No, I donít either. I donít want a black history month. Black history is American history.
Mike Wallace: How we gonna get rid of racism untilÖ
Morgan Freeman: Stop talking about it. Iím going to stop calling you a white man. And Iím going to ask you to stop calling me a black man. I know you as Mike Wallace. You know me as Morgan Freeman.
Jews to consider themselves a race.