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Killers that are calm, fair skinned foreigners in India are not likely disaffected Muslims.
I have no idea who is behind the terrorist attacks, but I know many people from the Middle East who do not fit the stereotypical look, so who knows.
An Palestinian coworker of mine (years ago) had thinning light brown hair and green eyes and an indecipherable accent. He was raised in a refugee camp and then eventually completed college in Minnesota..and the Minnesota accent was pronounced. My old Persian boss had dark hair, but the fairest skin I'd ever seen and blue eyes, if I hadn't known his background I would have guessed Irish or Scottish.
I imagine that no matter what the terrorsit's background is, some of the guys were picked because they would not be instantly seen as suspicious. It's the same reason that young women are being recruited more, they don't fit the m.o.