I really don’t mean to suggest his sister did anything wrong at all, or that the U.S. government should have been leary of hiring her. My only point was this: When I found out that the killer was South Korean, I immediately disgregarded any notion that the killer had any Islamofascist motives, since South Koreans aren’t known for ties to Islam. Many Muslim terrorists are converts, but I considered it unlikely that an American immigrant from Korea would have any sufficient exposure to radical Islam. If his sister were an expert in Islam, however, it may suggest that her studies provided some kindling for a curiousity in Islam in him, even if her interests were opposite his.
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You mean aren't known by you. there are multitudes of us who know that the high-point overlooking the large US Army Base in Seoul is the location of a huge Mosque. Don't assume that nobody knows that which you don't know.