It's a good thing President Obama signed a law earlier this year allowing loaded guns in national parks, otherwise the 75 or so folks who bothered to show up at that rally in Virginia would have had to find a place other than Ft. Hunt to hold their little tea party.
If that proposed change to the law was only about those wanting to hold rallies that encourage armed citizens to attend, maybe it would be silly. But it goes well beyond that tiny group of people to all those who carry for protection, the nation's sportsmen, and others who have reason to be carrying or transporting a firearm. The law prior to this could make travel through a state with a firearm very difficult. Many roads and highways go through national parks. There is a similar problem with many state laws that ban presence of firearms in state parks, creating even more potential problems for otherwise law abiding citizens simply trying to get from point A to point B or who don't wish to depend on the park rangers to be near by if they encounter a situation that calls for armed defense.
It was a silly thing for the ban to have existed in the first place. I give the President credit for signing the law, particularly since it goes against his prior professed ideology and the impulses of his left wing supporters.