Frustrating Answers
Rui had to admit that Prince Raul's critiques were more than just valid; they were sound. As a Martial Senior, Rui could commit murder and get away with it pretty easily. In fact, the Martial Union essentially used the crimes to justify squeezing out free labor from Martial Artists as a punishment
Martial Artists were not straightforwardly imprisoned for many years or decades. They were sentenced to Martial labor, as dictated by the Martial Union, which would squeeze them of all the value they could during this time until they served their sentence and were free.
On top of that, the sentences for assault and battery were crimes that were treated with a slap on the wrist, with sentences of labor that lasted months at most.