Although BPD may be caused by something external that triggers it, I still don't believe that it's the person's fault. Also, I do believe there must be some sort of biological something with them as well, which means person A has a biological trigger that causes BPD but person B doesn't ahve taht same biological trigger despite having the same environmental trigger.
It's all very complex.
Also for people with BPD I believe most of it is caused by some type of abuse or something happening in childhood, which in no way is the person's fault. So, although the key is learning new ways to go about things, they are pretty much just like us with BP. And in the end, it's really up to all of us to learn about our dx regardless what it is, and the best strategies for us to find wellness.
I think we're all in this together and stigma is stigma. BP people get told we're fake all the time.

I think we with mental illness are all brothers and sisters and need to stick together.