Cormac McCarthy's The Road suffers from a similar problem: the two main characters are good people, though the world they find themselves in and the people they encounter are unremittingly dreadful, until perhaps the end. Baby-eating cannibals abound; I couldn't take it seriously.
Quite! There does come a point where it's all just ridiculous. On a similar basis, _A Song of Ice and Fire_ loves to do this thing where the viewpoint character is apparently killed at the end of a chapter. The first few times it's quite effective but the third time one specific character was "killed" I exclaimed "sheah, right" and went to the Wiki. At that point I think it's fair to say it has lost any narrative force.
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