It's obvious that on they can be used for mass murders and it's the guns fault, not the user....
http://www.telegraph.co.uk/news/worldnews/europe/austria/11689726/Graz-car-attack-kills-three.html
http://www.telegraph.co.uk/news/worldnews/europe/austria/11689726/Graz-car-attack-kills-three.html