What is Atticus' view on capital punishment as revealed by his conversation with Scout in chapter 23?Harper Lee's To Kill a Mockingbird

The view that Atticus Finch has toward capital punishment
is that of an honest and conscientious lawyer: 

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"The law says 'reasonable
doubt,'but I think a defendant's entitled to the shadow of a doubt. 
There's always the possibility, no matter how improbable, that he's
innocent."

As an illustration
of Atticus's cogent points, the famous actor, Henry Fonda, produced a movie that is
shown often on the classic movie channel; this movie is a film adaptation of a play
entitled Twelve Angry Men and the narrative involves the trial of a
youth who has apparently stabbed his father to death.  Most of the action takes place in
the jury room as the jurors first vote 11 to 1 on a guilty charge.  But, Henry Fonda's
character insists upon closely examining all the evidence and reviewing the testimony of
the witnesses, their credibility, etc. for reasonable
doubt.  Finally, after several votes and more examination and discussion,
Henry Fonda's character convinces ten of the others that there is 'reasonable
doubt'--the other juror begrudgingly goes along--and the youth is acquitted.  Were it
not for Fonda's objectively reasonable character, the youth would have been found
guilty, just as Tom Robinson's has been.