Understanding

Why do people jump to conclusions about things. There are people who can be hit in the face with a bully, but will still say that it was a cookie, if they want it to be a cookie. Then there are people who will lie to your face about their real opinions, but then go behind your back and badmouth you to everyone. Why can't everybody just say what they really think. I know that sometimes it is hard to always be honest, but I know that I try and be honest with my friends. I don't know why people feel the need to lie in order to avoid a confrontation, but then say something so hurtful and mean a few hours later.