Well that was a silly post.
Your country has tanks, nuclear bombs, robots and you say if you have a revolver you are safe from the government. Ok!
A robber jumps you in the street. No worries! You have a semi-automatic pistol and you will defend yourself. Oops, the robber has a gun too. No worries! You are faster and you kill him/her. Noone takes your wallet.

By the way, I think this "should you be able to buy weapons from supermarkets" is a totally dumb thing to argue about. It's not a real problem, it's like gay marriage - a pseudo problem.