The argument for that kind of compulsion is survival of the collective. Compulsory military service in the case where an enemy army has a realistic chance of destroying your country. Compulsory service in the case where resources are so tight that if not everybody contributes everybody will starve.
If they had crashed on that planet naturally they would have been in that situation, but it was an artificial situation manufactured and maintained by Alixus.
If they had crashed on that planet naturally they would have been in that situation, but it was an artificial situation manufactured and maintained by Alixus.