Laying Blame

What is it about our mind that forces us to lay blame on anything other than ourselves? Sure no one likes to make mistakes, but sometimes shit just happens. Is our ego such a part of personality that we are rarely willing to admit that we have made a mistake? I would say that in many instances this is true. There seems to be no rational reason for passing blame other than it makes us feel better about ourselves. If you make a mistake, then get over it learn from it and move on. Dragging it out by laying blame will not help anyone. Especially when I'm the one getting blamed!