Finn has just admitted to being guilty while in the Zone Of Truth, meaning he is very guilty of second degree murder. I will not attempt to break him out, as he is guilty and I do not think his motives are enough to excuse him. He said his dad made a deal with the pirates that raided his village, and that he exchanged Finn, Finn's mom, and Finn's Sister in exchange for his and the town guard's lives. I do not think that is a good reason, as he is trading three lives for the lives of many, and I bet that is what his father thought.