The title says it all

Rating: 9/10 (14 April 2008)

The point of the movie was that Texas was "no country for old men" which is supported by the conversation at the end with the man in the wheel chair. Bell wasn't able to catch Chigurh because he was too old, His time as a law man had past. It was his time to step down and retire. Thats what he was explaining in his dream at the end. I think that the author of the book probably was able to make it a lot clearer since he had a different medium, but the Cowen brothers did a fine job using the big screen. Chigurh was even hit by a car in the end after killing Moss' wife and he was still not able to be caught. I think that says a lot and supports the notion that Bell was not able to catch him.