Well, as a short-story writer, I don't think there are any weaknesses to the genre itself. I guess I would say that the difficulty of the form is that one must create an entire world in five to 30 pages, as opposed to 300. There is very little room for fat - you must be economical. And you must begin as close to the end as you possibly can.
It's not that tens of millions of people all want to be violent. But they share the worldview that then, at its extreme, gives rise to the violence. And in my view, this is why this is such a global problem.