"It may be objected that if weapons that are most useful in military service – M-16 rifles and the like – may be banned, then the Second Amendment right is completely detached from the prefatory clause."
True, and there's no legal reason to claim one is somehow detached from the other, as Scalia went on to explain.
" Our only political party has two right wings, one called Republican, the other Democratic. But Henry Adams figured all that out back in the 1890s. "We have a single system," he wrote, and "in that system the only question is the price at which the proletariat is to be bought and sold, the bread and circuses." " The whole fabric of society will go to wrack if we really lay hands of reform on our rotten institutions. From top to bottom the whole system is a fraud, all of us know it, laborers and capitalists alike, and all of us are consenting parties to it." " - Gore Vidal
One wants to take other people's money to buy votes, while the other just wants you to keep more of your own money.