I think it's a combination of a bunch of things, but just as a comparison, women attempt suicide more than men, but men die from suicide far more than women, because men are more likely to use messier methods like a gun or jumping, while a woman is more likely to attempt with something like cutting or an overdose, far more likely to save their life.
The aggression and I guess... fearlessness maybe isn't the best word but I think you know what I'm going for... plays a lot into both of these statistics.