’Oh, you are going to perform an act of heroic virtue: to confess you murdered your father, that the valet murdered him at your instigation.’
Supposing that he did agree, it would still follow that Dmitri Karamazov is the murderer and the instigator, and Smerdyakov is only a passive accomplice, and not even an accomplice, but merely acquiesced against his will through terror.
There are no more uses of "instigate" in the book.
Show samples from other sources
The group is accused of instigating the violence in the area.
She does not think the current leadership will instigate significant social reform.