Could Someone Explain Me This Movie

Rating: 6/10 (2 October 2017)

The Cohen brothers are known for their brainy, meticulously crafted, character driven films. I love "Fargo", and "No Country For Old Men" had all the elements of another masterpiece, yet it is not. It is a very well made movie, very well acted and with some high impact action sequences and some nasty gore thrown in to make things real, but since I know little about the characters, little I care about them or what happens to them. You have Javier Bardem as psychopathic killer Anton Chigurh. Where this guys came from, what's his purpose and why does he carry a powerful air gun (with which he can shoot people dead at close range or blow door knobs off). You have Josh Brolin as Llewelyn Moss, an average Joe with a military background who happens to stumble upon a drug deal gone wrong and grabs a suitcase filled with 2 million dollars. A surviving drug dealer, bleeding to death in his truck asks Llewelyn for some water. The guy will not last more than a couple of hours at the most. Llewlyn drives back home with the 2 million suitcase. Instead of packing things up immediately and leave town with his wife Carla Jean, he makes the incredibly STUPID mistake of going back to the scene of the crime carrying a gallon of water. It seems he wants to give some water to the dying drug dealer but for this, several hours have passed, it's dark now and sure enough, the drug dealer's dead, not before a rival gang sees him in the distance and chases him, until he escapes by jumping into a river.
That was the stupidest plan ever and sure enough, it sets the ball rolling for the rival gang to try to find Llewelyn Moss and get their money back. The rival drug gang assign wacko head Anton to go after Llewlynd, which turns "No Country For Old Men" into a tense thriller.
Everything was going just fine until the abrupt ending, where town sheriff (played very laid back by Tommy Lee Jones) starts mumbling some monologue stuff, as if to tie some loose ends of the story and suddenly, Poof! The end credits start rolling. What happened to Anton? Did he actually killed Llewelyn's wife? No I'm sure there are some brainy reviewers here that might say that films leave certain stuff for people to make their own conclusions, but this is really over the top. I actually thought my bluray disc player had stuck and jumped over to the credits but no: that WAS the actual ending.
One thing that also really bothered me were the shoot out sequences. It appears that Southern Texas is devoid of a police force, since we actually see very few of them, in spite of fire arms being fired left and right, at night and in broad daylight. It reminded me of Mexico, where you can do this sort of stuff during a traffic jam only to have police arrive an hour later. But Mexico is like that, uber corrupt, far more than ANYTHING in the States. Throughout the entire film, I didn't get the impression the police were after Anton Chiguhr, save for the very end.
All in all, I enjoyed the movie. I only wish my brain could be far more developed to understand the meaning behind this film, the abruptness of how it ends and what was it all about