Sigh
THere is a reason this film was up for many Oscars (and won many Oscars)...CAUSE ITS BRILLANT!!!
Seriously, if you hated the ending then if I were you I would rewatch it or something cause the ending is the best part. It is deep and touching. Tommy Lee Jones' monologue really hits home.
As far as showing Brolin getting killed goes...why??? The Coens were doing something less conventional and it worked out perfectly. Brolin was offed just like that and that was a great move.
Of course, I dont expect a number of you "simpletons" to understand this film or book. That would be asking too much.