The history of Arlington Cemetery was taught to us, in Military History class, back when I was in ROTC.
Along with a number of........uh, finer points about the Civil War. Such as the West Point graduates, who served the Confederacy, are still considered "war heroes", as they served their country. (Back then, ones state was considered to be their country; not the USA.) Which is why there are Army bases named after Confederate generals. Much to the chagrin of some folks. (Like members of the extended family who had ancestors held in Andersonville. Oh, well.)
The point being when the Army taught us Civil War history, they covered a lot more than just the direct military angles. I don't know how it is handled today, but back in the day, they went out of their way to present a complete and unbiased account of all facets of it.
Could be wrong, but I suspect the true story of Arlington would be glossed over, if covered at all, by today's Army.