the guy used a huge quantity of dynamite in that instance. something like hundreds of lbs iirc. it's much easier to get guns in todays society that that much explosives, even for an armature pyro.Does no one pay attention to history? Before video games, the worst school massacre in US history happened in Bath Township in 1927 where the school treasure blew up 38 children and 4 adults because he wasn't reelected.
Again, if there are no guns, these monsters will find ANYTHING to kill.