No.12647056 ViewReplyOriginalReport
A moot point that's constantly brought up:

Taken from the SBS in Volume 4 -

Reader: Why doesn't Luffy ever kill his enemies? If you look back, he didn't kill Mohji, he didn't kill Helmepp or Captain Morgan, or anyone. Well, Zoro was the one who beat Morgan, but still. Why?

Oda: Ahh, good question. First of all, Morgan is still alive. His former subordinates put him in prison. So why didn't he kill him? In this era, people put their lives on their beliefs and convictions, and fight. Luffy goes into battle and destroys others' beliefs. When these enemies' beliefs are shattered, and they lose, they feel a pain as great as dying. I think that for these pirates, killing or not killing is secondary to winning or losing.