Thing is, governments and law enforcement agencies do use various technologies to snoop, pry and monitor persons of interest... and others, so who's to say there aren't devices capable of watching and/or listening to people in their own homes, etc. They mightn't be bothered with you or I, but I'm sure there are others who are under surveillance with high tech equipment.
As for the tinfoil hat, I have several... not to mention dozens of rolls of Alfoil for just in case.
Yes, and there are Thought Police who can read minds....
....and a tinfoil hat is no defence!!!!!
You can't even run away and DIE ....cos then there's Séance Police.....