do you need a gun to protect yourself?

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do you think the Environment you where lived in is safe?just like your block ,campus and other places. somebody say that i feel very unsafe and i need a gun ,just look at my block and my kid's school where always has violence crimes happened. it is illegal to have gun in china no matter what reasons you have .but crime caused by gun in china very less than that countries allow to have gun. here has a argue is that gun can cause more crimes or protect you more. do you really need a gun?