Most people are oblivious.
At a ceremony for my daughters college. In a small chapel.
A small woman with a large polymer pistol open carry on her hip walked in. During the ceremony. The gun was bigger than she was.
She was wearing black pants and a tight white shirt. Probably campus security? No badge, no ID. The way she walked in and sat up front was odd if she was campus security.
Anyway nobody in my family noticed her. She walked right past our pew.
I mean how do you not notice someone walking into a quiet room during a ceremony with a gun?