The discussion about Amazon and knives is a silly diversion by the establishment trying to smear the blame on some evil corporate entity, is it not? What would be an alternative sources of knives? Given that knives that common tools, perhaps the nearest kitchen or shed? Technically, one does not even need a special instrument to kill a small child. In the absence of a knife, a hammer, screwdriver, table leg, brick or his bare hands would have perfectly sufficed.
The suspect being 'Welsh' reminded me of this cartoon: