I understand what common sense is supposed to mean. But I don't understand the huge variation in human behavior that you run into every day. There are people who make an effort and believe in caring for others and watch everything they say. And there are people who look as others as just specimens and are easily expendable and they don't care what comes out of their mouth (and none of this seems to bother their conscience). Walk through Manhattan like I did the other day and you'll see what I mean. It really messes with your head.