Why would you need a gun in a civil society?:
With the other issues of depending on the government aside, you need one to protect yourself. Regardless of whether the police are there to protect you, if you have a person break into your house in the middle of the night, you may not have time to call the police. Even if you do and they are only five minutes away, you can be killed a hundred times over in five minutes. 

You have a right and a duty to defend yourself and your family.