Jesus the people hating on No Country just sound so daft...
Anton didn't kill Llewellyn, the Mexicans did.
Llewellyn called his wife and told her to meet him in El Paso, where he would've helped her escape danger and fly away somewhere with her mother. However, this never happened because before his wife could make it to El Paso, the Mexicans had already began surveiling her whereabouts, with the mother in law unintentionally giving away Llewellyn's location.
Also, when Anton took the chicken farmer's truck, he asked about the nearest airport, which the farmer said was in El Paso. This is how Anton ended up in El Paso, albeit late.
Y'all vapid fukkers just wanted a straight forward action movie, I'm guessing because all the violence before the ending wasn't enough for y'all.
When you watch the film again, try to actually pay attention to the dialog, because the film transcends the fukkin money.
The sheriff's struggle with growing old and essentially inadequate in his line of work; Llewellyn's hubris; Chigurh's philosophies and principles; they're all fascinating and done so well.
Very well rounded film.