Be decent to people. Treat everyone with fairness and empathy. This doesn’t mean that you lower your expectations or convey the message that mistakes don’t matter. It means that you create an environment where people know you’ll hear them out, that you’re emotionally consistent and fair-minded, and that they’ll be given second chances for honest mistakes. (If they don’t own up to their mistakes, or if they blame someone else, or if the mistake is the result of some unethical behavior, that’s a different story, and something that shouldn’t be tolerated.)