Gun traffic is one of the most profitable business around the world as a drugs and human trade. Looking for some statistics I found that small arms manufacturing in US represents roughly a $2 billion dollars a year industry. Everybody knows that the companies involve as National Rifle Association, have a lot of politic influence in the government. I think It is the main reason because have been difficult to obtain a restriction gun police in US. But also because from this commerce is derived a lot of other international business as for example: The "private's army forces".

Private's army Forces (mercenaries) earns 100 thousand millions dollars each year, a quarter of the total amount inverted by US in the millitary field (400 thousand millions dollars) and have become a new way to make war and money in this century. http://hamptonroads.com/node/66331
It can be a good way to put the public money in the hands of private finances.
The death is a day by day deal, the consequences of this huge problem everybody knows and everybody is tired of listening: people die, who doesn't die is tortured, wounded or stolen or has to become a refugee by the hand of the war that we are financing, direct or indirectly.
How really knows where is his/her money?. Taxes are going to the financial capital and then....
I don't wish to know who has been murdered by the hand of the taxes that I have been paid in order to be a good citizen.

I think that by making governments take measures as the approval of the law for gun controlling, people can help to gain control over, which is a moral problem, the final destiny of their money.