Because of Pride, each party doesn't want to lose on an argument that's why is it hard to say sorry.
To said sorry is actually hard for us because of pride and I do agree with you and if we are able to keep ago and pride we would have a peaceful world. Many countries are in war now because of ago. Family including husband and wife are having misunderstand because of just saying "sorry"! It is one of the easiest words to speak but it is hard in the mouth of many of us.