It's so hard to get gun in other developed countries. People even afraid to carry gun in there. But why government of US makes it easy to buy,carry or sell guns? Is it good for the nation or people living there? They mayn't get freedom while walking in dreary places. Isn't it? I even scared of word gun. 
You have to understand some facts here.
In American constitution all citizens have right to have guns, in order to protect themselves.
It's in their tradition and culture also that average people can have guns, without any limits.
Of course, in America is also a lot violence and people are scared.
It's very complex issue really.
Ask yourself, who profit most from gun culture in America?