People with BPD can become violent. So can almost anyone. The reasons just tend to be different. If a person has it in them to attack others over something, it's gonna happen regardless. For a person with BPD, the snapping point is more likely to be centered around fear of abandonment. For people without BPD, it could be a rather wide variety of possibilities. BPD doesn't make people kill anyone. All a BPD diagnosis could do in the case of a murder is tell investigators that, if a person with BPD was found guilty proven by science, it was probably an abandonment issue that caused it. I've known someone who was murdered over an ounce of weed, as well. Some people have it in them to kill when they are simply emotionally upset, be it a jilted lover situation or, I guess, an ounce of weed.