(1) Everybody does not have information/knowledge about everything.
(2) Whatever knowledge people may have, other people may not and vice versa
(3) When people make mistakes inadvertently, they do not deserve to be called fools.
(4) When people are angry/upset they should cool down before reacting
(5)...
more... Having knowledge alone is not enough, knowledge with humility is needed
This is true for everyone including myself