Re: Why oh why
Just needs a plumber's friend poking out from the top front piece.
What is it going to do when it detects a concealed weapon? The human may have a license/permit.
Lock down the immediate area, enclosing innocents in with a potential hostile actor? Now boxed in, with targets.
Call for and wait for humans to be dispatched from central?
Multiple threats and your few meat sack units will be overwhelmed.