What can teach parents that no one wants to hear their screaming sprogs?

Parents are perhaps the most selfish class of people out there, maybe even worse than SUV drivers and Libertarian Party members. I was at brunch recently, and a couple brought their baby in with them. They seemed to think they can ruin a public space for everyone else just because they can reproduce. It turned out after half an hour of it screaming that the prudish hipster troll was too bashful to breast feed it in public and apparently didn’t want to leave to do it in the bathroom or something.

Is there any way to get parents to show more respect for those around them?