What is the purpose of using a gun

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I believe that many of my friends said that, they possess gun because they want to protect themselves. Is it the solely purpose our government allows its citizens to legally possess a lethal firearm? Some people might misunderstand the usage of gun. You can find out from the news all over the nation, people shoot each other because of anger, and desperation to vent it out as a warning make to known to the public. Now, more and more teens involve in violent shooting in our public place. Due to the same reason, angry without sane judgment. We just don't feel safe anymore, because from all these incidents, our government still not banning the usage of gun. Won't you agree?