Why kids don't know s---!

OK So I went to the library booksale. This should be a relaxing way to support a very good cause and pickup some bargains at the same time. Not so! It was busy and somewhat crowded which was to be expected at mid-morning of the first day, not a problem. As I browsed my way through the barn I came upon a young (6 or 7) child sitting on the floor in the middle of an aisle, reading a book, oblivious to the world. My first thought was that his parents had lost track of him in the crowd. Evidently not, as a moment later a woman a few feet away handed him another book,saying "Here's another one you might like". My question, then, is how can we expect the children to know anything when the people who should be teaching them don't know anything! I thought about saying something about the child or someone else being injured when they tripped over him, but didn't feel like getting the nasty looks and the "miserable old man" comments . So I decided to take my few purchases and leave, while hoping that when someone did trip over him, his parents didn't decide to sue the library! Since it certainly wouldn't be the parents fault.