I right is not a declaraction of necessity. It's just a limit on legislation. It's not a guaranteed freedom or a duty of citizens. It's ONLY a limut on legislation.

"Congress shall make no law" is the term that should ring in your head when thinking about the scope of a Constitutional Rights.

Freedom of religion doesn't say religion is necessary it just tries to equalize the freedom for all who want it. Speach too really, you aren't really required to talk much and exercise your freedom of speech, it's mostly optional. 2nd ammendment right is the same. It's a limit on legislation to control guns that ensures the OPTION to get a gun remains an option, but still only an option. It doesn't proclaim that all citizens should get guns.