Outside of the fictional world of Harry Potter, there are many sufferers of mental illness. One of these is PTSD (post traumatic stress disorder). The mind forms opinions that become so real that people with this illness cannot think rationally (sensibly).
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contrapositionWhat does the highlighted part mean?The "not" in "not when" links with (and elaborates on) the "not" in "they don't need." The "when" in that sentence is explanatory.