Perhaps on the rare occasion pursuing the right course demands an act of piracy? Piracy itself can be the right course? meaning

Governor Swann said this about Jack Sparrow at the end of the movie 'Pirates of the Caribbean'.

Explanation:

Here, the word 'piracy' in the sentence refers to being unlawful or acting in an unlawful way. Jack Sparrow saved the life of Elizabeth who was the beloved daughter of Governor Swann. Also, Governor Swann believed that Jack Sparrow was a good man. Also, Norrington was in love with Elizabeth. So Governor Swann raised this question that 'Perhaps on the rare occasion pursuing the right course demands an act of piracy?' means that letting Jack Sparrow go will be unlawful but will be the right thing to do. The reason it is said in the form of a question is because Governor Swann is checking whether Norrington is on board with this idea and that 'Piracy itself can be the right course?' means that it is possible that he is proposing the right thing here although it will be piracy or negligence of duty on his part. But it would be the right thing for Jack Sparrow.