You can site a particular occurrence and profess it as proof and if a thug is killed in a situation it surely does "deter" that individual... Could you please explain why gun ownership in the US is 80 or 90 guns per 100 person but we don't seem to have the most crime free nation on the planet?... Doesn't quite seem to add up... According to you all we need to do is arm everybody and crime will go away, for some reason that doesn't seem to be working..