It took generations for the liberals to erode our Second Amendment rights. It is only since 1967 and the infiltration of communism into pockets of this nation that the cause has been accelerated.
What is even more disturbing is that the majority opinion is that "arms" are being defined as those "commonly in use" which does not include sawed-off shotguns and, possibly, machine guns.
Well, the reason shotguns and machine guns are not "commonly in use" is because they are tightly regulated, restricted and banned in some places.
The 1986 machine gun ban stopped the production/conversion of new machine guns for the specific purpose of being "commonly in use".
In 1934, NFA took us from near-total RKBA freedom to most of the restrictions we have now in a very very short time. Prior, you could get a Tommygun mail-order; after, whole categories were banned for all practical purposes (with a tax some 4x the cost of the item) and intense licensing (loosely defined) as a model for others to follow. It may have taken decades/generations for the ripple effects to spread, but dropping that rock did not take long at all.
Your well-understood point amounts to attempting to un-ripple the pond, when the better & faster solution is to drop another rock in.
BTW: listen to BCR. He is...well-versed.