When you choose to cover up the mistakes of someone, because of your love for them, or because of brotherhood, sisterhood, you're their parent , relative or family member . Don't just choose to make excuses for them, but also choose to tell them what they did wrong, so that they won't repeat it again. If you cover for them, but they don't see their fault. They will never do right and one day, the wrong things they do. They will do them, to you or to someone you really close to.