herd immunity works (or so I've heard)

While busilly deploying to the swarm a good friend the Professor Von Explaino remarked 

"I have no plan to fix these bugs. I’m just going to keep deploying them until the end users develop a herd immunity to them."

I expect he'd heard it worked somewhere ... herd immunity that is ... but they could also be pretty bugs

“He remarked to me then,” said that mildest of men,
          “‘If your Snark be a Snark, that is right:
     Fetch it home by all means—you may serve it with greens,
          And it’s handy for striking a light.