You're right. They're not a standing army nor a modern society, so it should come as absolutely no surprise and be completely understandable and justified that they hold a human right, life, to be more easily surrendered than modern first-world countries. But they don't. Desertion isn't acceptable, never has been, and likely never will be in any solvent group. At least not armed paramilitary groups where the deserters took a ship on top of deserting. Out of curiosity, what do you think any other faction would have done in that scenario?