Court: Breaking Your Employer's Computer Policy Isn't a Crime

That whole preface was a compromise of sorts, a sop thrown to the anti-Federalists who wanted to outlaw standing armies and depend on the militia system. Which just wasn't practical in such an unthreatened place like the US, compare to Switzerland---and I wonder what will happen with their post-Cold War downsizing when things get hot again.

And there was the minor detail that George Washington, the essential man in all this, wouldn't sign off on such a prohibition. He's not as anti-militia as he's sometimes made out to be, but his position that a complete dependence on the militia system wouldn't do was unrefutable.

The well regulated part of it came from the observation that if you just keep the militia's weapons in armories except for formal practice and fighting, an excuse the British used to confiscate all of them in Boston, the militia members aren't going to be any damn good with them when put to the test.

Again going back to the Swiss system, at least during the Cold War once you were in the reserves you had to qualify with your personal weapon once a year, failure to score high enough signed you up for a 2 week refresher course. So they have an insane number of 300 meter range lines, subsidized and very high quality ammo sold at them (in theory you're supposed to use it all up on the spot), and a whole bunch of other things to encourage good marksmanship.

Hmmm, you know, going back to what the British did back then, very few of the arguments are new, and the Constitution and the Bill of Rights were based on direct, living memory of their depredations back then. Modify at your peril.

Evidence for this?

Revealed preferences show Americans buying firearms in steadily increasing numbers, e.g. both November and Black Friday hit new NICS records.

Echoing Pyxl101, "Quis custodiet ipsos custodes?" ("Who will guard the guards themselves?"). We gun owners believe we provide a needed bulwark against the worst forms of tyranny, and certainly notice that 20th Century tyrants for some inexplicable reason fell disarming targeted populaces was a prerequisite to slaughtering them wholesale. Given what an abattoir the 20th Century turned out to be, maybe you should seriously consider that bit of unpleasant history?

No. There were two dissents, one by Stevens, one by Breyer. From Wikipedia [0]:

The Stevens dissent seems to rest on four main points of disagreement: that the Founders would have made the individual right aspect of the Second Amendment express if that was what was intended; that the "militia" preamble and exact phrase "to keep and bear arms" demands the conclusion that the Second Amendment touches on state militia service only; that many lower courts' later "collective-right" reading of the Miller decision constitutes stare decisis, which may only be overturned at great peril; and that the Court has not considered gun-control laws (e.g., the National Firearms Act) unconstitutional. The dissent concludes, "The Court would have us believe that over 200 years ago, the Framers made a choice to limit the tools available to elected officials wishing to regulate civilian uses of weapons.... I could not possibly conclude that the Framers made such a choice."

Justice Stevens' dissent was joined by Justices David Souter, Ruth Bader Ginsburg, and Stephen Breyer.

Justice Breyer filed a separate dissenting opinion, joined by the same dissenting Justices, which sought to demonstrate that, starting from the premise of an individual-rights view, the District of Columbia's handgun ban and trigger lock requirement would nevertheless be permissible limitations on the right.

You must be thinking of the Breyer dissent. Even that does not stipulate that the right is individual, but just argues that even if it is, the DC law was permissible.

Even people who agree with you on the issue recognize that the Stevens dissent does not support an individual right [1].

[0] https://en.wikipedia.org/wiki/District_of_Columbia_v._Heller...

[1] https://reason.com/blog/2010/06/28/justice-john-paul-stevens...