Don't Let Resentments Fester Many things that go wrong are caused by misunderstandings or screw-ups. These lead to resentments that, if left unaddressed, can fester for years. But if people are given a forum in which to express their frustrations about the screw-ups in a respectful manner, then they are better able to let them go and move on. I have seen many cases where hurt feelings lingered far after the project, feelings that would have been worked through much more easily if they had been expressed in a postmortem.