Q) if you are so confident in the training of the U.S. military to not commit war crimes against its own people, then what is the purpose of owning the guns at all?
A) Refer to the Red comment above:
"These restrictions on the government are a toothless tiger if there is no way for the people to keep the government in check,..."
Q) Why permit the general ownership by the public of weaponry that kills thousands upon thousands and maims and scars many more per year?
A) Roughly 33,000 "Firearm Deaths" each year with 2/3 (or 22,000) being suicides, that leaves 11,000 to non-suicide firearm deaths, which is 1/3 of 1% (0.0033%)of the entire population of the United States. And that IS including all justified and gang related firearm deaths. ( https://fivethirtyeight.com/features/gun-deaths/ - I would suggest looking at the "Explore the Data" button to apply filters. And read the methodology of the Data compilation)
And should a decision of one person not wanting a firearm restrict an 80 year old grandmother from choosing to have a great equalizer against a mid 20's meth-head who broke into her house for drugs/money/anything sellable?
As for me, I choose to be the protector of my own safety. A by product of that is that everyone in my immediate vicinity is also within my realm of protection and I will protect them as well if the need arises.
And as far as the Mujahideen and Viet Cong being brought up, ėwas just to point out historical occurances of technologically inferior forces being able to successfully combat a technologically superior force to the point of conceding defeat through voluntary withdrawal. And that it is possible.
And some research into firearm usage in self defense may take you in an unexpected direction if you are able to find some unbiased reporting of it. One I have found that reported on it second hand is here ( https://capitalresearch.org/article/why-is-the-cdc-hiding-its-defensive-gun-use-statistics/ ) and I only picked that one after reading their about page here ( https://capitalresearch.org/about/ ). The info is out there, it is usually buried, but I know I have read a direct report from the CDC page, I just could not find it this time around.
Sorry for the length, your response was multi-tiered with a few different questions and points needing address. Another reason it took so long.