No Country For Predestination

I finally finished watching 'No Country For Old Men' the other day.

Like many of the other Coen Brothers' films No Country played with the themes of fate and free will and I especially enjoyed the end of the film when Carla Jean tells Chigurh that the decision to kill is his alone- that the coin is not the deciding factor.

If you've seen the film I'd love to hear your thoughts on:

Whether the random accident at the end is symbolic of anything?
Is Bell destined to die, even if he retires?
What's up with Chigurh's coin toss?