I suspect it's a common trait among elves. Look at Rhunon the sword-smith. Happily makes countless swords that are used to kill humans and urgals and ra'zac and probably dwarves too, but the moment one of the swords she made is used in violence against her own people she's all "woe is me, my craft (of making murder weapons) has been sullied, I have been betrayed, I swear to never make another weapon ever in case it too is used against elves (instead of humans, like all the other swords)".