Granted, my knowledge of the US Constitution is minimal but doesn’t the old-timey phrase “A well regulated Militia, being necessary to the security of a free State” translate to “A well run military, is necessary to the security of a free country”. Who would disagree with that? (except dictators).
The courts.
The course have decided that the “militia” part is irrelevant to the meaning of the amendment. It’s just an introductory phrase, say the courts.
Does it say somewhere else that “free state” specifically means “the right to state militias” and not as it reads?
Our Constitution is pretty vague, so resolving a lot of the vagaries is left to the course.