Since forever? Have you ever been to a public library because it's pretty high up there on the top 10 list of kids hangouts right behind GameStop and supermarket parking lots. Most schools have them, teachers want their students to go to them. Why would you not expect to see kids in a library?
"Some of us have shit to do". Like writing stupid posts about having to wait in line. How dare people bring their kids to the library and then use the bathroom??? Well what are you doing all day at the library that's so important? Loser.