I would not expect people from all countries to understand the right to bear arms. I would expect that all would understand and acknowledge the history of government tyranny and oppression in the world. Americans have an inborn mistrust of government and the right to bear arms arose from the experience that created that mistrust. Our native Americans are an excellent example what happens when a government's power goes unbalanced. The U.S. was not invaded by ground forces of Japan in WW II in part because of the armed citizens. If you don't believe that my being armed is a deterrent to you imposing your own will on me, then I invite you to come and give it a try. The numbers of armed law abiding citizens is a very similar deterrent in regards to a government with similar intentions. While a government might be able to overcome the citizens it wishes to oppress the difficulty of that task makes it very unlikely. On a smaller scale it is also a proven deterrent to individuals that wish to do others harm. Laws do not prevent criminals from possessing weapons of any kind. Laws merely deter law abiding citizens from prescribed items and or activity.