The people who suffer from it seem truly sad and pathetic. They are very lonely and they don't really have a "sense of self" to fall back on if they are rejected by other people. They have little to no developed sense of identity. In order to feel "whole" or even human they tend to latch onto other people. If they are rejected, they react with terrible anger and hatred.
Here is a perfect example of borderline:
I think most stalkers are BPD. Any thoughts on this disorder or those who suffer (or are enjoying) it?