What's the best film you've seen in the last few years? Doesn't matter when it came out
Recommendation
(reddthat.com)
That was the point, though, I think. It's a commentary on how society treats violence and mental health as individual, isolated character flaws rather than as systemic problems. Having a female & feminine character be the violent/troubled one was a brilliant choice imo because it goes against our stereotypes and further highlights this. That uncomfortable feeling you have would probably be less so if it was a character you expected to have issues like that