I think they are trying to emphasize, the blond and blue will be sent in if they start relying too much on Mid East stereotypes.
I think the possibility of those type of recruits is vastly outweighed by the needle in a haystack factor of treating ALL passengers to the same diluted level of scrutiny.
Limited resources, limited ability to scrutinize, limited ability to delay and inconvenience all passengers, dictate that profiling be used to limit the universe and subject the dangerous few to the highest level of scrutiny.
Besides the EL AL Israeli model has profiles for the blond and blue eyed.
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In 1986 a Palestinian terrorist, Nezar Hindawi, tried to blow up an Israeli airliner by sending his pregnant Irish girlfriend on board with a bomb in her luggage. The El Al screeners in London profiled a young pregnant woman traveling alone as suspicious, and found the bomb of which she had been blissfully unaware.
http://www.chroniclesmagazine.org/cgi-bin/newsviews.cgi/Intelligence/_Profiling___A_Nece.writeback