It may be hard to believe a fellow professional may choose his own religious future over the lives of a few hundred Kuffar. This infiltration is aided and abetted by diversity. When doctors are willing to bomb Nightclubs and Airports why not Pilots? And do not think he is the only Pilot either.
Islam is on a charge at the moment. The insistence this faith is peacful would be laughable if it weren't so dangerous.
HuT is not proscribed because it suits other purposes, otherwise it would be.
This empoyment curtailment is called disruption. Better to help an employee you fear is going to kill your staff and customers to the door than the alternative.
Just because you have not been told what is known by the Service does not make them wrong.