OK how would you know if he is carrying concealed?
Two things here are evident. He isn't the moron. You are.
If I decided to cary a weapon (handgun), I would certainly NOT advertise that I had one. If someone has a CCW permit, they can easily carry but still not advertise. I understand why the police stopped and detained them, one never knows who has those guns and what their intention might be. Error on the side of caution is fine with me.
I look at the profile under the shirt.......And this guy's admission of same.