The world can only be safe and peaceful if the people can control gun. Without controlling gun I think there is no way to make the world safe and peaceful for the mankind.
And this point of view can never be attain by any of us. Nobody can never control the use of gun. It's like this, if you obliterate all rapist in this world and whenever there could be people that are curious in raping, there would be still rapist. It's like with the use of gun, if you ban guns, there would be more curious people using it.