This sort of thing really worries me. I don’t think that it’s at all about “catching criminals” or protecting one’s family.
I suspect these are mostly where internet sex tapes come from.
How is having a spy camera going to protect you?
I suppose if you had a spy camera running while you were doing a job interview with Louis C.K. it would have helped, but mostly all I can think of is how these are tools for abuse.
The picture at the top – of the mandatorily-hooded “bad guy” peering through the door-chain – implies burglary or home invasion are threats that this camera somehow helps with? Perhaps it would be useful after a bunch of cops kick your door in and shoot you, or something like that. But, by then, it’s too late for you.