Guilt

I think that it would be useful to separate actual guilt from feeling guilty. We cannot control our feelings of guilt. We feel bad about something that we have done in the immediate past, because we wish that we had the ability to alter the past. Unfortunately we cannot. Moral actions are something that we ought to do, and ought implies can. As such, I don't think that we should incorporate guilt into morality given that we cannot alter the past, meaning the guilt can have little role in it. The feeling that we identify with guilt, which is more of an extension to empathy, perhaps, is useful in allowing us to realize that we have done something wrong and that we ought not to do that thing again. Determinism hardly affects this given that, once a person realizes that something is wrong, because they feel bad (and they cannot control that) they know that they should not do that again. Additionally, effectively, humans have the illusion of choice, and if something doesn't cause them to alter their negative behaviors, we ought to try to help them to become determined to do so.