I'm thinking it's both.
Anyway, typical Murasaki, breaking other peoples stuff then blaming the stuff for not being stronger. Yuuno being a martial artist/murder weapon really doesn't fit her, though the conflict it represents does shed some light on why she seems so withdrawn and disturbed all the time.
Hopefully her self-loathing isn't stronger than Ginko's since I'd rather she end up with Shinkuro in the end instead.