Like Dakota in Planet Terror, extenuating circumstances probably come into play here.
The 2010 adaptation of Cormac McCarthy's post-apocalyptic roadtrip novel shows 'The Mother' (Charlize Theron) in flashback, with the audience slowly piecing together what happened to leave The Man travelling across the American Wasteland with only his son at his side.
The reality is as devastating as it is shocking, with The Mother snapping under the threat of cannibals, starvation and death, prompting her to merely walk away from the pair in the middle of the night, never to be seen again.
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