Short version: The report goes back to 82AD to understand the intent of the use "militia" in the 2nd Amendment. The main motivation for the 2nd Amendment is to save the people from financial debt. Standing militaries are expensive. Wars are expensive. The 2nd was intended to mobilize the citizens for national defense so they wouldn't have to pay taxes to maintain military spending.
So, looks like we have some work to do to bring the country back into accordance and I'm not sure it will ever happen.
Ofcourse, a citizen can't be a part of the militia to help carry the burden of national defense if they don't own firearms, or have enough food, water and ammo to last the engagement, so keep stockpiling, training seeking education, etc.