God, one of my coworkers is like that, she has alerts setup whenever someone so much as walks on their lawn. I've had to talk her down a couple times becuase some delivery guy walked across their lawn to get to their neighbors house, which she thinks is someone casing their house to either rob/burn down/murder them.

She's genuinely a nice person and pretty lib (which is good for our reactionary small town) but holy shit what suburban mindset does to a mf.