Oda should go take some lessons on how to explain a main character's reasons for being reckless.This chapter was horrible. I don't see why ppl keep giving chapters like these 5/5 week after week. No story progression, no character development, no advancement whatsoever besides a single attack for 1 page and talk/flashbacks for 19 other pgs... Kishi and Kubo should both really go and take some notes from Oda on how to keep a manga continuing without diminishing the content.
/rant
As far as we know, Luffy was born fool-hardy. Born a klutz that happens to only be proficient in fighting because his Grandfather is a vice-admiral.