Just read up on that case. What a bunch of evil, malicious twisting of the meaning of words - something courts do all to often!
If you think the Wickard decision was twisted, try US v. Miller.
The decision upheld the conviction of an Miller for possessing a sawed off shotgun without the $200 stamp. By the time the case came to the Supreme Court, Miller was dead, and his attorney did not have the funds to have his pleadings printed and travel to DC to submit them. So the ATF attorney blatently lied and said that a sawed off shotgun was NOT a military weapon even though millions of soldiers from WWI had direct experience that it was called a “trench broom” during the trench warfare. No defense was there to rebut these lies. So the justice writing the opinion, who evidently knew better, wrote his opinion trying to ignore evidence that should have been submitted.
In any case, the decision said sawed off shotguns were not protected by 2A because they were NOT military weapons.
But wait ... there is more. The assault weapons ban law specifically outlawed military style weapons. It was held to be constitutional, citing Miller as holding laws that banned weapons as constitutional.
The internet has made all of these opinions accessible to other than constitutional law students.