No, I won't kill you.

But I won't hesitate to break every bone in your body and throw what's left of you through the sickbay door if that's what it takes to curb my desire to kill you.

[Fear wan't what Khan was looking for, though it would be a much more acceptable alternative than blithe disregard. Kirk deigning to show a little discretion would be ideal, if he's even capable of it.]