By now, anyone who's glanced sideways at the internet and the IT systems that connect to it should be totally aware that it's a very unsafe place, riddled with hackers hell-bent on causing grief for innocent users.
You'd think the hackers would know as much too, but as a few amazing stories lately tell us, they can be as vulnerable as the rest of us.
If true, the Dutch signals intelligence and spy agency AIVD managed not just to break into the Russian Advanced Persistent Threat 29 hacking group, also known as Cozy Bear, but to sit in their network for a long time, maybe as long as two-and-a-half years.
During that time, they were able to use CCTV cameras to watch the Russian hackers go about their attacks, and to identify several people through the imagery they intercepted.
APT29 is thought to be behind high-profile cyber attacks on the United States Democratic National Committee, the Pentagon, and the Dutch and Norwegian governments.