I think I should clarify on NCFOM, when Bell quit, it was a realization that he couldn't 'see' this degree of evil. In the beginning soliloquoy, he said "to see this evil, you would have to be a part of it, sell your soul." Now Chigurh was in the room, and maybe Bell even realized in his gut that he was in the room, but he couldn't see him, he couldn't put together the disparate elements of what he had before him, the air conditioning grate and the coin, the presence in the room, so he came to a crossroads, sell his soul and track this down, or wake up and retire.
- I need Malcolm. You're too Martin. Know what they did to him, they killed him. . .
- Didn't they kill Malcolm too?
- No, no, no, they say that. But ain't nobody seen the body since the funeral.
- That's how funerals work.