A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms, shall not be infringed.
In 1787, when the 55 members of the Constitutional Convention signed the United States Constitution in Philadelphia, Pennsylvania, good guns that could be held and used by a single fighter were still handmade, expensively-crafted things: a soldier could (perhaps) load and fire his musket three times a minute, but rifling (which allows more accurate aim) was known but not practical for army use. The “right to keep and bear arms” would as likely have referred to a sword or a pike as a gun. If the US had remained a string of small countries along the east coast of North America, it would certainly have made sense for them to do as the Swiss have done, and require every able-bodied adult man to be a soldier.
Switzerland allows any citizen (or indeed law-abiding resident) to have a gun if they want one: but the gun must be licensed. Further applications for gun licenses may be granted on request, each for a specific gun. Virtually every adult man attends regular annual training sessions, and holds a military rifle and ammunition under seal – which he is not allowed to use without specific orders and must keep in a safe place so that no one else can use it. If the US resembled Switzerland, insistance that the Second Amendment mattered terribly much would make sense.
There are a lot of differences between the US and Switzerland. Switzerland has four official languages: the US has none. The Swiss Confederation was founded on 1st August 1291, making it nearly 480 years older than the US. The US shares land borders now only with Mexico and Canada: Switzerland shares land borders with France, Germany, Italy, Austria, and Liechtenstein. Switzerland has fought no wars of aggression in its over-800 years: the US has fought more wars of aggression in the past century than any other nation in the world. Switzerland founded the Red Cross: the US founded Guantanamo Bay. Neither the US nor Switzerland are members of the EU. And they both like guns.
But whereas Switzerland likes guns if controlled, licenced, and regulated, in the US for decades political lobbyists have been getting the Second Amendment redefined not to mean “every citizen has the right to bear arms in a well-regulated militia”, which is its common-sense interpretation, but to mean “Everyone should
buy own as many guns as possible!”