This blog doesn't exist solely so I can carp about the evil doers around me. It 's actually an educational tool.
I know that when I ask someone to silence their cell phone, or please wait for his/her turn in line, I get a an icy "how dare you tell me what to do!" glare.
Here's the thing: It's not that I want you to behave. (Partly. But that's really not it.)
Etiquette is about demonstrating respect for others around us -- whether we know them or not. And when we show respect for others, we're showing respect for ourselves.