Self-destruction and the destruction of other life are closely related in the mind. The dividing line is very thin.
12 seconds sound clip from the The Doctor Prescribed Death (Suspense) classic radio play.
You can hear this line at 00:01:41 in the radio play.
Quote context
[...]
- I worked on that theory for a long time. I am positive of it. I know it'll work.
- Suppose it will. What good is it? What good have you accomplished if you can prove it'll work?
- An ordinary human being who suffered reverses is sick of it all, he wants to leave it all behind.
- And you say he can be changed to want to kill someone else...
- I do.
- Why?
- He told me that in his opinion you should be in the asylum.
- Mr. Granger said that? Does he think I am insane?
[...]