"And no, it doesn't worry me. The moment you come in though you get filed on. Simple."
Nice.
Maybe a better attitude would be to talk to the guys on the edge of the zone, or passing nearby so that if they look like they are about to enter the zone a well timed "Oi!" would prevent the infringement. Surely a 20 second conversation for them to tell you that they are nearby, no service required, is quicker than moving lots of heavy metal about to keep separation when someone infringes? This is how you could reduce some infringements, the one of a pilot in a high workload environment. Agreed, pilots should plan better, but human error happens.
As for those who cannot navigate in good viz should be grounded, well, other factors may be at play in the cockpit you don't know about.