The USA is clearly better off with the Second Amendment than without it, no question about that. More countries should have it.
However tracing back to its original intention, "against threats like foreign invasion or domestic tyranny", it was a failure as the USA is effectively invaded by a foreign nation and there's nothing the people can do about it, no "well-regulated militias for the defense of a free state" have even formed.
[Grok] "The Second Amendment to the United States Constitution, ratified in 1791 as part of the Bill of Rights, was primarily intended to protect the right of the people to keep and bear arms, ensuring the ability to form well-regulated militias for the defense of a free state against threats like foreign invasion or domestic tyranny. Rooted in the experiences of the American Revolution and English common law, it reflected the Founding Fathers' distrust of standing armies and their belief in an armed citizenry as a safeguard for liberty, while also encompassing individual self-defense, though interpretations have evolved through Supreme Court rulings over time."
