All the people looking at their phones in grocery line, while riding the train, waiting for anything, while paused at a stop light in their car, it's everywhere.

"Can't" is different than "don't want to."

Is reading on your phone on the train fundamentally different than reading a book? Is chatting with your friends while in line at the grocery store bad?

Your point about the stop-light is true, though, because it's unsafe.

The President of the United States of America for one