If I were there, I’d look at him politely, ask him if his company actually gave them any real training, and tell him that if he isn’t expecting to actually shoot someone, he should get his hand off his gun.
Every law has these hidden words tacked on the end:
“or we’ll shoot you”.
He also needs to be asked - “are you willing to shoot someone who goes to look at the Liberty Bell?”
In a way, this is good. People need to understand the inherent malignance of government.