in the 1940s were mentally ill

实施过脑叶切除术的病人大多
and resided in state-run institutions.

患有精神疾病住在州立精神病院
The doctors there felt they were providing mercy to the patients,

那里的医生认为他们这是为病人着想
but the use of the camera tells us

不过嫌犯使用了摄像头
that this unsub wants his victims to suffer.

说明他想要折磨被害人
And the emotional torture of being left paralyzed

而让被害人瘫痪所导致的精神折磨
is a kind of overkill,

算是一种过分之举
and that occurs when there's a personal connection

只有在凶手和被害人之间有私人恩怨时
between the offender and the victims.

才会发生
He wants them to suffer, but he also wants to witness

他想要折磨他们又想亲眼见证
what it's like to be them.

被折磨是什么感觉
He's given himself a front-row seat.

他给自己买了头排的票