It makes people feel better when they understand everybody has sinned. Then they know they aren't different from anybody else. Yes, and it helps us to know that there's no other way to get to God except through Jesus. We sure can't do it ourselves. Well, uh, let me see.
Sin is evil.
It's doing bad things. Sin is really not depending on or trusting God, isn't it. It's doing things our own way. That's a good way to put it. That's why we need to accept Jesus as our Savior.