Considering how much damage I could have done to myself, I decided that I need to not race down steps anywhere from now on. I've been thinking about how I landed--on my left hand, arm and side. As a guitarist, I depend on my arms and hands. Had I broken any bone in either one of my hands or arms, what would that have done to my music? My hands and arms are far to valuable to be lost to my carelessness.
Blaming someone or something else doesn't erase the fact that I fell; it only causes more pain, more grief, more injury. Plus I would feel worse about myself, because I've now done something to hurt someone else (even the dog).
Isn’t this how it is with sin? We’re doing something that we shouldn’t be doing, and we fall. At first the damage is either not visible at all, or appears to be minor. It’s only when time passes that we really experience the damage caused by our sins. It's why when we go to confession, we pray an "act of contrition", where we resolve to make a conscious effort to avoid sin in the future.
But more importantly, I think, is how we react when we realize we have sinned. We have two choices. We can claim full responsibility, or we can find someone or something else to share the blame. Sure, we can try to convince ourselves that we aren't entirely at fault, if at all, and that by finding this other person/thing to blame, we're really acting out of a sense of justice. Ultimately, we're just rationalizing--saving face and feeding our pride at the expense of someone else. As time goes on, what would the constant shirking of responsibility do to our sense of self? Not to mention the fact that through unrepentent sinning we're killing our souls.
I suggest instead a complete examination of conscience. Periodical examinations of our attitudes and our behavior help us to pinpoint where we are most in danger of committing sin, thereby causing serious injury to our souls, which puts our souls at the risk of an eternity apart from God. That's what sin ultimately is, after all, an injury to our soul. There are several examinations available online (here is one to get you started). I know, it seems like a lot of work, almost as horrifying as that long put-off trip to the dentist; but I think union with God is worth the effort.