Ah, the fashionable mental illness tag.
Of course there are people who have a genuine mental illness, but as it’s so ‘in vogue’ at the moment, It comes in very handy for the weak, the attention seekers and the downright evil.
Doctors seek to give human aberration a recognised medical label, because they cannot define medically what the rest of us see as wickedness of the most despicable kind. Having a mental illness does not absolve anyone from responsibility for their actions.
It’s funny how in so many cases, any “voices” or mental illness often seem to be concealed from those around them.
‘Normal’ criminals can be cunning, clever and determined not to be found out. That is the hallmark of any criminal, not just those with mental illness.