Is this about No Country For Old Men? In my eyes, this film is about the inability of traditional forms of Western justice to deal with the type of criminal we see nowadays. In this film, Tommy Lee Jones is a very reserved, soft-spoken, honorable, and polite gentleman-Sheriff. He is all about upholding the law and making sure that the people in his town/jurisdiction do the right thing. But, implicit in such a way of doing things is the expectation that those whom you bring to justice are honorable and straight-forward themselves. Anton Chigurh isn't like this in the least. He's a principled man, but he only makes good on the promises he makes to other people, which are never that promising in the first place (e.g., if you tell me where the money is now, I won't kill your wife later on, but it's too late for you). In the end, Tommy Lee Jones can't save those whom Anton Chigurh goes after, and thus he sees himself as a failure. But, his failure isn't personal; rather, it has to do with the way he goes about things.
See, now I get the entire movie. This is why I love you!