Importance of black and white

a) Please be reminded that we need to write down every important thing in black and white form to avoid any argument in later days

However, a lot of ppl ignore it and suffer in later days. why why why?????

b) furthermore, some ppl are more concern about 'face' when he or she knows that he or she has done something wrong. they do not wish to listen advice from the seniors. why why why?????