Yes...I thought that was your meaning...and I have a view on it....maybe a bit difficult for me to explain....but I shall try.
Many times we in the heat of a "discussion" or because we have "false information" (can be made in our own brain") we do or say dumb thing.
We might call them mistakes, but I think the action might not be a called that, because it is a direct action from what we believed at that moment.
The thing that is the "bad mistake" is our unwillingness to later evaluate our action, and to put down our "pride", and take the first step to fix thing.
Our Pride, is many times our "curse", because it prevent us from fixing thing that might do many people more happy, especially inside family quarrel.
This "Pride" must be override by all parts, first the one who takes the first step. then those who are approached,so they are willing to accept.
We all make up our own thoughts about an incident, and what is said or done, but none of these thoughts are the real truth, because they are all colored by ourself, and the information we had on beforehand, together with what it has develop into over time.
So I think we must be more willing to lower our Pride, and be willing to face those "mistakes", if we so do, then we will learn from them, and the mistake is again our teacher
And what we all must have in mind is: The day "tomorrow" might never come , for some, and most of those who "still live" are sitting back with a feeling of guilt...."Why did I not fix this"...."Why did we loose so many years over this small problem", and so on.