I totally agree with that, meanwhile I think mnky meant that illness doesn’t necessarily remove all your judgement. You can have totally coherent thinking on a field while being incapable to reason on another. Easy exemple : Math and Empathy, where schizophrenic may excel in the former while lacking the later. Someone affected by trisomy 21 have more chances to get the opposite. <- generalization for illustration purpose, those affections are complex and schizophrenia is a spectrum anyway.

Even for non-Ill-defined, PTS and other trauma or just learnings- can do that to anyone and age doesn’t help to escape the reasoning-habits. Wise are those that can stay free from mental cages.