The motion light over a driveway comes on for a cat, for a fox, for a plastic bag in the wind. It is not lying — something did move out there. It simply has no opinion about what.
The part of you that runs the worst case works to the same specification. It is not a liar and it is not a prophet. It registers a possibility and has no way of weighing it.
Which matters when it goes off, because the right response to a real signal from an over-sensitive sensor is neither obedience nor argument.
It is a look out of the window.