I guess so. What if you are a regular person, suffering from stress, a sleight, or whatever and just flip on society? For example, in America if you are of legal age can you walk into a store and buy guns and other projectile weapons without a license?
Say the crazy person was me, I wouldn't know where to go to get a gun here. I could buy swords because I have a license, but many can't now because of legislation. So I would be limited to performing a crazy attack like this nutter with just bladed or blunt weapons, or run the risk of trying to buy items to make some kind of explosive device. There is no guarantee of any success.