I know ownership of weapons in America is a highly contentious topic so I fully expect to get modded down aggressively for this post. I want to try out the argument anyway. Please humour me.
Let us imagine two different countries: Macroland and Microland. The governments of the two countries are mostly similar, with two notable exceptions.
The government of Macroland punishes resistance to its rule heavily. It jails approximately 0.7% of its population. Its enforcement troops kill about 60 of its own people each month.
The government of Microland is dramatically less aggressive. It jails only 0.1% of its population, but more importantly, it virtually never kills its own citizens no matter what they did or how strongly they resist the government's rule. It took Microland about a quarter of a century to kill as many people as Macroland did in just one month.
Which country has the most oppressed people? Microland or Macroland?
I think most reasonable people would say that the citizens of the country that kills them the most often are the most heavily oppressed. After all, what's the basic power that lies behind abusive government oppression? What's the basic mechanism governments use to remove people's freedoms? It's violence. The country that dishes out the most against its own people would seem to be the most oppressive.
You have, of course, already figured out that the statistics given above are real. Macroland is the USA. Microland is (just for comparison) the United Kingdom.
Americans have the US Constitution and it is a mighty document. The Constitution has always been a vital part of protecting the freedoms of ordinary Americans from overreach by government. Yet the Constitution is flawed in one terribly dramatic way. By allowing and even encouraging a heavily armed society, it fails to strike any blows for freedom - as police have always had and always will have better access to top grade weaponry and armour. The chances of ordinary US citizens successfully mounting an armed uprising against the government is zero. And yet it simultaneously gives those same police a cast iron excuse for arming themselves to the teeth, as they are expected to enforce the law against an exceptionally dangerous population.
The result is that whilst Americans and British people have very little differences in their levels of freedom, they have enormous differences in their chances of being executed by their own governments ..... or by random mental patients.
I am British and I would like to see the UK adopt a US-style constitution. But not if it included a copy of the second amendment. Real data from today's world seems to suggest it makes no real difference to freedom but does make the world a vastly more dangerous place.