I think its completely understandable on an emotional level to wish Brady suffering of the level he has caused both to his victims, and to their surviving families.
But the only way to avoid being as inhuman as he is, which drags us down to his level, is to be entirely human.
That is why he is cared for as much as possible until he dies - not for his benefit, but for ours.
Caring for him makes us human, which he is not, and stops us from being him, which would drag the human race down to the pit in which he has existed throughout his life.
I am old enough to remember the outrage of the Moors Murders at the time, and that feeling has never really lessened over time, which is why Brady is still such a reviled individual.
I will not mourn his death, but I will not rejoice in it either - I will not take pleasure in death as he did, I will not think like him, that would diminish me, and he was and is not worth that.