A man in Sweden shows up at a school, kills a teacher and a student with a sword. Why didn’t he show up with an assault rifle or a handgun? Maybe because it’s not easy in Sweden to purchase or steal firearms.
Why didn’t he kill more people? Maybe because he didn’t have a firearm. Wouldn’t it have been better if all the teachers and students were packing guns? To defend themselves?
Or maybe, more likely, if they had all been armed maybe even more people would have been killed by stray gunfire. Maybe.