Yeah but they always think they have a gun, or so they say. It's not always having a gun pointed at you, it's the threat that it could happen. Very real to American police that keep them on edge, where in other countries that risk is lower so there is less sensitivity to a suspect moving there arm near a pocket or behind their back if they are far away from the officer (which makes it naturally harder to see what they are going for). Not saying it's a good thing, it's just a large contributing factor.