From NBC News:

As Americans, our constitutional rights and individual liberties are not just a source of patriotic pride but the lifeblood of our democracy. The founders knew that the right of citizens to bear arms was essential to the preservation of democracy and liberty. The Second Amendment ensures that Americans can protect themselves, their families and their businesses, especially when the government is unwilling or unable to do so. And many Americans are indeed now choosing to exercise their Second Amendment rights; a national indicator for gun sales is at an all-time high.