Specifically around the security guard example, the mere presence of a security guard should deter thieves (in theory), so I think the analysis is a little more

Specifically around the security guard example, the mere presence of a security guard should deter thieves (in theory), so I think the analysis is a little more nuanced than "security guards investigate weird noises". Unless this all went over my head and that's all sort-of the point of what he's getting at . . ?