Good vs. Evil. Is it that simple?

"Leo?"
"What."
"This is very important to me. Because I like [him]...and don't like him. I feel two ways about him. Have you ever felt two ways about a person?"
"I only feel one way about him."
"How?"
"Scared." (The Stand, page 682)

Leo, a young boy who only recently replaced grunts and yells with words, knew exactly how he felt about this other character. While Larry, a 20-something-year-old man, was still confused and conflicted about how he thought about this same character. Is the ideas of good vs evil over-complicated by older people? Leo got a gut feeling about this certain situation and acted on it, while Larry didn't want to make any fast assumptions.

The Stand is full of characters who are constantly having to make that super important decision between the good and the evil. However, very few of them are able to see the evil in their own ranks. Evil people linger with the good people and not many see how evil they can potentially be, even though they see the obvious difference between good and evil. They may not like the evil people but they still don't recognize their pure evilness.

Is this a good quality? Forgiveness, turning the other check, the idea of not judging and only seeing the good in people. Those are all good qualities, right? When present in The Stand, they don't seem that great. All of the sudden, the bad guys seem worse and the good guys aren't standing up for themselves enough.

This, to me, is where the good and evil become tangled. How do we protect our innocence without turning evil. To turn a person, who is seemingly evil, out of their good society, they would be doing an evil act. But the longer the evil person stays, the more people affected and maybe turned evil.

Leo may see the evilness in a person before others but does that make the distinction between good and evil simpler? Or does it just prove that even though we may know good vs. evil we can't successfully do anything about it?