Super late to the party, but had to comment...
Do others remember crying and not knowing why they were crying as a kid (8-14 years old)? I would do that from time to time and my mom would ask me what was wrong and I'd tell her I didn't know so she's tell me to quit crying. I would just be annoyed and walk away where CMJA would take that as a personal slight against her. Not her parents fault, but because they didn't know the had a BPD child on their hands and how to handle her these things happened. I'll write more later (after I'm off work, lol) on BPD since I've had years of experience with a BPD mom, but for now please know that in no way does BPD mitigate cruel, heinous, murder.