First, we should understand that Kane's act is intended to demonstrate self-sacrifice to the skeptical Cutshaw (and others). While believing himself to be a non-violent psychiatrist, Kane had tried and failed to give such an example, and he acquiesced that an apparently heroic suicidal act could be less than this - an act of despair, or perhaps an unconsidered reflex. Kane's desire is that his suicide will be something different, nothing but a deliberate and selfless giving of his life. The essence is: what is the reason, the thinking? But then, complications. Kane's suicide is committed by someone who has been painfully reminded that he is a man with much blood on his hands, and he has subsequently killed again this very night, despite himself, or despite part of himself. Therefore we cannot be sure that there are not mixed motives at work, such that his action stems partly from despair that he has failed to separate himself from 'Killer Kane' other than temporarily. So it is not wholly clear that Kane's act does constitute the desired example, and presumably Blatty chose to write the script as he did well aware of all this. How much confidence Kane had that his example would hold up can only be conjectured. ("I don't know... no other way now...") Having said which, evidently Cutshaw was convinced, so at least in one important way the ambiguity doesn't matter.
By the way, does anyone hear more clearly than I do the very last words of Kane? "Oh God, I [indistinct]" Or perhaps someone knows from the screenplay?
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