People who loose their minds in rage do this all over the world. You don't have to have BPD to split someone black, like many normal people do when stressed and lets say someone who cuts you off when you are driving or steals your purse. The problem is that BPD outburts are cyclical in nature (as in...once split you will be split again, unless the pwBPD is in substantial recovery...) and what it unfortunate is the core belief that they are powerless against their rages feeds and grows this "need" for an outburst. It's like when a heroin addict sees a needle and they cannot resist the drug even if they are in recovery. The pwBPD, when their fears and pain are triggered, they cannot resist the emotional addiction to go full DEFCON 5 and lash out at everyone and everything, until they are exhausted. So it is really very sad. Because they want to be seen as good people so badly, but they mess it up over and over. That is, until they 1) stop running from and admit that they are indeed, responsible for their own rages and 2) also admit that their recovery from these rages is going to take a lot of time and work - but that it is WORTH IT to change the entire self-relating structure and stop hurting themselves and others (that short term gain from splitting doesn't equal the long term cost of destroying relasionships.) I had a diagnosed BPD mother. She could control her rages. She had 2 masters degrees, was a member of our church, and a respected career. She choose to split me time and again because I was her "operating" ego. In the sense that I became her parent, even though I was her child. Her concept of herself as "powerless" feed her toxic relationship with me. Until I left and someone else became her target, no one believed me that she was like this, or that she "had control." They all believed her that she couldn't control herself. If she couldn't control herself around her adult daughter how in hells bells did she manage to keep a non-tenured job as a teacher of over 30 impoverished, abused, low income 1st graders? The same is true for my dad. He is uBPD, and I thought h was NPD for a long time. In fact he may be more BPD than my BPD diagnosed mother. Same things happened. He never was "Responsible" for his rages, and yet strangely he could control them perfectly if anyone accidentally saw them.