Fisrt of all, Nacua punched a man in the back of the head. That's a cheap-shot, by definition. Regardless of what happened to him, his hits were vengeful and retaliatory; he was not "protecting" or "defending" anyone at that point.
There are plenty of honorable - and dishonorable - people from all cultures. Stating that because of racial descent, you know that a particular person acted honorably is absurd.
Additionally, you seem to be forgetting the strong Polynesian gang scene. I'm sure there are quite a few punks in gangs that steal, cheat and kill without provocation.
While I'm not saying that Nacua is any of those things, I am pointing out that there are plenty of examples of dirtbags, from all walks of life. I wish you would leave Nacua's race out of it.