The same day the FBI denied me from buying a gun, I left the store with a gun anyway?

I have never been convicted with even a misdemeanor, yet somehow without any due process, FBI agents believe they have the authority to restrict me and many others from purchasing a gun. FBI agents and most other state and federal agents believe that they are above the law. The law clearly states that no government in the United States shall infringe upon the right of an individual to keep and bear arms. This certainly includes purchasing them, trading them, carrying them, and using them to defend yourself. When those who control the force of law, believe that they are above the law, then the people are in a very precarious situation.