[Romulus]

That’s a line of reasoning worthy of, well, a muslim. Using the same logic, I can “prove” you’re a muslim.

A. Some muslims commit mass murder with aircraft.
B. A German guy committed mass murder with an aircraft.

Therefore, C: The german guy is a muslim.

This is the logical fallacy of the undistributed middle, I believe. Google it.

[Bloody Sam Roberts]

Not so. I'm not interested in whether it is a logical question. Only the investigator's insistence that any such question about the co-pilot is irrelevant. That is a ridiculous stance. Given previous occurrences, even excluding 9/11/01, there is precedence enough to make it a valid question.

About 5 years ago an Egyptian pilot drove his plane into the ocean while giving praise to allah. So the question is relevant.