The reason why gun control advocates want this right overturned is because they are in favor of centralized political control. They believe that their class, namely, the intellectual class, is in control of the agencies of civil government. For the most part, this assumption is correct. They assume that their class, and only their class, has the wisdom to allocate weapons. They believe that their class alone possesses the right to determine which citizen has access to weapons, under which circumstances, and for how long.
In effect, the gun-control advocate is rather like a medieval knight in the 15th century. He resents the fact that weapons are becoming cheaper, and that the common man who joins the Army becomes a threat to his social class, and therefore to his social standing. He resents the fact that his weapons no longer give him a monopoly of violence. Weapons have come onto the market, and these weapons can be used effectively by commoners who do not spend decades of training in their use.