I justified it through making him have to learn through circumstance. Usually like if I want to be a thief type character they are born into being a street urchin or crime syndicate. Since my current character is a Lancer (in-game dragoon) I have it coming from his father leaving him a lance as an heirloom so it's all he carries with him more out of superstition then anything else. Which in turn forces him to learn how to use it to defend himself.
EDIT: DANG IT I KEEP FORGETTING MY CHOCOBOS TODAY!
EDIT: DANG IT I KEEP FORGETTING MY CHOCOBOS TODAY!
Every time you put a chocobo in a post an angel get its wings.