Or, to be charitable, thinking the best of people.
In the aftermath of the Peter Connolly case, we were repeatedly told how the mother was a clever, plausible, manipulative woman who was able to twist professionals around her finger. Then we saw video footage of her, and saw a dishevelled, incoherent mess with a long history of mental health issues: the precise opposite of the elegant, cool deceiver. This was not American Psycho.
Now in the Daniel Pelka case, we are asked to believe that no-one could have seen through the mother's story that "Daniel's dramatic weight loss was due to a rare genetic disorder". Not a teacher, not a social worker, not (ffs) a consultant paediatrician. We then hear a recording of the 999 call, and (again) it's an incoherent woman who can barely speak English. How was she able to spin a subtle and coherent web of lies which fooled all the terribly clever professionals, when she couldn't string a sentence together?