
Our anger is often more directed at the individuals who commit mistakes rather than the mistakes themselve
There's a quote I really like from Seneca:
“A great part of mankind is not angry with sins, but with sinners.”
It is part of this larger paragraph in Seneca’s book “On anger:”
“We have other men's vices before our eyes, and our own behind our backs: hence it is that a father, who is worse than his son, blames the latter for giving extravagant feasts, and disapproves of the least sign of luxury in another, although he was wont to set no bounds to it in his own case; hence it is that despots are angry with homicides, and thefts are punished by those who despoil temples. A great part of mankind is not angry with sins, but with sinners.
Regard to our own selves will make us more moderate, if we inquire of ourselves:—have we ever committed any crime of this sort? have we ever fallen into this kind of error? is it for our interest that we should condemn this conduct?”