SP, you are exactly on the mark actually, in that we are our own worst enemy. We control our mind, even though some may not think that be the case, we do. The key to many things within us, is that we know how to dispell fiction from our own logic, by replacing it with fact, reason and reality. If we do something wrong, then accepting we have done wrong is part of the process, but instead of dwelling on the negative aspects, we must learn to use the negative aspect as a learning element. That learning element can then be transformed into positive active within us, which means we go something like:

I just shot a man, taken a life. Why? Was it in self defense? Did I do it just because I didn't like the person? Was it an accident? If we are guilty off an offence such as severe as taking another life, then we serve time in jail for doing so. Jail is our sacrifice for committing such an act with no underpinning factors. We serve our time, get released. Now we either go and shoot another person and have learnt nothing, or we have learnt from our mistake, or injustice, forgiven ourselves and ensure we never do such an act again. We ensure we do not get involved in wrong activities that could put us in such a situation again. We do not own or possess a gun. We move on in life, even though such an injustice has been committed, we have served our time in jail for our crime, if it was a crime.

If self defense, then what was the outcome going to be if we did not shoot that person? Would we be dead instead? Self defense is something many people struggle with guilt wise.

This goes down to the most insignificant of life factors, such as did we check our mirror before changing lanes? No... we hit another car. No persons hurt, just objects. Our punishment is going to come in the form of payment off insurance, and so forth. We made a mistake by not checking our mirror when changing lanes, an accident occured. Learn from the lesson, in that regardless what is happening, we must check our mirror before changing lane, and look over our shoulder for visual even.

This is what blame and guilt are about. We can dwell on the negatives, the actions we performed or where involved, or we can forgive ourselves atleast and use our mistake to learn from, so that we don't make the same silly mistake twice.

This applies from little to big things in life.