Why do you think the author chose Harry Potter did not kill voldemort? Was it because harry was "a good guy" so would not could not kill? or?

Consider Harry did kill quirrel, in self defense, also ma of ginny and ron weasley killed bellatrix when she was attacking, so why not write harry killed bad voldemort.

Harry and his 2 wands against voldemort
Harry and his 2 wands against voldemort

was this a choice and if so why? or no option because the film was a documentary where harry could kill him but the event was he did not?

Updates
+1 y
i refer to the time of the last duel when v' had elder wand.
Why do you think the author chose Harry Potter did not kill voldemort? Was it because harry was "a good guy" so would not could not kill? or?
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