Do you judge family or friends based on terrible/stupid things they have done?

Everyone makes mistakes, and you cant understand someone until being in there shoes. When people tell you upsetting things they have done, things that are a shocker how do you react? Do you try to understand them, and if so in your mind are you disappointed by there actions? Does this change they way you think of the person or how you look at them? Is it wrong for something like this to break a friendship,relationship, or family? Aren’t real friends supposed to stick with you no matter what?Sorry for all the questions. I am just interested on peoples opinions.