Gun enthusiasts live in constant fear that the federal government will someday come and take away their guns. The imagery and pageantry of this fear is pervasive, contributing to a strange state of gun-owner paranoia.
In this video interview, science writer Michael Shermer explains why such a scenario (and comprehensive gun control in general) will never happen in the United States. In short: Gun control is not a popular policy in the United States, or at least not popular enough, and the Supreme Court has again and again protected the Second Amendment in relevant decisions.
That said, Shermer notes that there's no real good reason for why a normal citizen would need to own a military-grade weapon such as an AR15 and AK47.