The NRA's policies and actions pose a threat to U.S. citizens. They promote and contribute to the violation of the fundamental human rights of "freedom from fear" and "right to life" (the right to life is the essential right that a human being has the right not to be killed by another human being). They pose a "clear and present danger*" with regard to the 1st Amendment.
*a standard for judging when freedom of speech can be abridged; "no one has a right to shout 'fire' in a crowded theater when there is no fire because such an action would pose a clear and present danger to public safety."