Why would I feel guilty about something that happened yesterday? That was another guy. I was just born last night. It's true that I am an exact replica of the guy that did that thing. So I should be careful not to do the same thing as he did. But to feel bad about it (to feel like I'm "bad" because of it) makes no sense.
In fact, those who believe that there are "good" people and "bad" people are really asking for trouble. Each of us makes millions of decisions over a lifetime. Some of them will be "good" -- considerate, wise, or courageous. Some of them will not. We all will make "bad" decisions. For those who think that they are "good" people, these "bad" decisions must build a sneaking suspicion in the back of the mind that they really are "bad" people.