I have never heard any politician anywhere in the world ever say that the removal of guns will stop mass killings. I have heard some say it could reduce the number of possible deaths or make it harder for some people who may want to use a gun on a killing spree to get their hands on more powerful weaponry. These numbers actually do bare out during the 10 year period of the assault weapons ban law of 1994-2004 with the total number and percent of population mass killings. That being said, tougher gun laws will not stop all mass killings, and even if another weapons ban were instituted to reduce the percentage of mass killings per 1,000 people; as the population grows the number of mass killing would eventually rise as a total number of killings. Much of the problem has to do with the fact that people who initiate mass killings are planning out the attack on their victims and therefore will inflict a lot of damage whether their victims have guns or not. The element of surprise is their greatest weapon. Additionally, while many Americans want to carry their guns all the times, a lot of private property owners (businesses) do not want everyday citizens to carry guns as it hurts their business. So if you target people in a club, store, etc you need to rely on security or the police. This is my two cents, don't need the usual suspects to reply to my answers or ask me questions as this is my statement.