Don't go off-topic.
Hmm you are right, admitting to your mistakes could be one of the best qualities found in a person. I guess it is part of the human nature, the subconcious mindsets that if we are corrected by someone then that makes us weaker somehow.
They perceive it as criticism, which they then perceive as a personal attack. We fail to realize that to acknowledge your weakness and admitting to your mistakes is seen by most people as a good quality.
And let's be honest we have all done this before one time or another, not in Graal but generally.
"Always go to other people's funerals, otherwise they won't come to yours."