User blog comment:DarkSkullPirates/Different Views/@comment-118.97.31.90-20121010130605/@comment-4889755-20121010212340

If you put it that way, Morgan Arc was for Zoro, Buggy Arc was for the map, the mayor, and Nami, Kuro arc was for Kaya, Usopp and Usopps village, Baratie for the cooks and Sanji, Arlong Park for Nami again, Lougetown was self defense though.

That just shows, Luffy fights if theres something in it for him. In lots of cases its his friends being happy.