Should the son be in trouble for not killing his father?

A man is condemned. His son is ordered to carry out the sentence. In order that his father would not face the dishonor of being slain by own son's hand, and out of filial respect, the son leaves his father adrift at sea. The father is unexpectedly picked up by pirates and joins them. The father helps the... show more A man is condemned. His son is ordered to carry out the sentence. In order that his father would not face the dishonor of being slain by own son's hand, and out of filial respect, the son leaves his father adrift at sea. The father is unexpectedly picked up by pirates and joins them. The father helps the pirates pillage the son's town.

Why should the son not be in trouble for not killing his father?
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