I am sorry to read that friend of you went through such a horrible thing.
At least, I assume he survived, though. In the European countries, because of the lack of guns and ammo, and because of how difficult it can be for the average citizens to get access to guns, people who are mentally unwell and have feelings on inflicting harm on others then resort to weapon and means which cannot be easily regulated by the goverment of the law enforcement agencies, knives being the quickest and easiest choice for them to pick up. I recall an specific case about a young United States citizen living in the United Kingdom who had a shotgun properly registered to his name, and chose to become a mass murderer, shooting without reason to random people on the street, after murdering his own mother. It is very scary.