Mistake By Chance

Everyone says Luck by chance.But no one says,'I have committed Mistake by chance.Everyone says,'It's not my mistake.No one ready to commit his/her mistake.Most of the time people put blame on other & even sometimes put their mistakes on others.
Generally,people thinks that if they commit their mistake then they have to apologize for it & they don't want to bend knee before others,because they think it creates bad image of them infront of others.