There are sins and there are crimes.
The basics of law in the United States and most of the Western World are based upon the Judeo-Christian tenets of faith. You know them; they were codified by a Jew who came down from the mountain, after talking to the Almighty, only to find that his followers were worshipping a gold calf. A little later, another Jew came along and narrowed it all down to "Love one another", with the additional instruction to "Love your enemies".
In other great societies that allowed for mercy and forgiveness, but did not necessarily believe in the stone tablets of the Ten Commandments, formed their own sets of beliefs, which, when examined, are closely related to the Judeo-Christen view of justice, and, in most cases, originated prior.
Today's subject seems to be about sin, about the Seven Deadly Sins. I won't name them, as to be redundant, but the worse of those sins is pride.
These sins spoken to in various ways by the bloggers, all had some sort of origin in a god or gods. And to displease the god or gods meant anger, hurt, punishment, atonement and, sometimes, forgiveness.
What does the atheist do when faced with the probability of a sin, or, let us call it, temptation? Then does the deed of whatever of the Seven Deadly Sins presenting?
Maybe the atheist is caught and punished under laws derived from "sins", and maybe not.
What guides the atheist when alone, when there is no concept of "sin" and when the probability of being caught by those enforcing laws is nil? Why have virtue? Why accept justice originating from the hocus-pocus of god or gods?
Some of these "sins" or "laws" are just not natural. Whose to say what "gluttony" entails? Or "sloth"? Who decides what here, and why? Then, why should the atheist submit to the codification or popular conception?
Human nature calls for you to commit the deed, and your pride says, "Why not."