The typical aphorism is "Locks only keep honest people honest."

Really, even securing your house is tricky. My place in Florida was built with the hinges to the front door on the /outside/ because of local building codes. Unfortunately, I only realized that after it was built. The locks are nice, but any enterprising thief would simply pop the hinges and remove the door if I hadn't taken steps to prevent it.

Bypassing locks is easy, and security systems are only useful when law enforcement is at the ready (rare in many places).

I had a girlfriend who would leave her sliding glass door ajar with a 2x4 to prevent it from being opened enough to let a person through. This was until I demonstrated that, unlatched, the door could just be lifted out of its frame and set aside.

I think their point was that the person has to be at your house. E.g. they can't systematically and remotely try the door handle of homes halfway around the world.