I will try to respond to your statements by reviewing them and making suggestions.
Your first statement:
“Hello again, Allen. Of course, I would not want any 'glorification' of harmful disputes between people. If the site the tourists visited was a 'showcase' for the defeat of the Sioux, then I would agree with the woman's actions. However, I don't think her actions were appropriate because I believe the site is just a tribute to a period in history [akin to the Bunker Hill Monument and the Gettysburg battle fields].’
My answer to this paragraph is to read the following link;
“The Buffalo Soldiers were just that: soldiers. If the term 'enemy' is to be applied, it should be applied in that context. For example, I would not want my own countrymen who descended from Free Persons Of Color to label me as 'a coward' or 'a loser' based on the fact that one of my ancestors was captured and sold into slavery. Therefore, I do not think it is just for my fellow countrymen to label the Buffalo Soldiers 'enemies' outside of the context of them being soldiers fighting in a war on behalf of their country.”
My answer to this is the following link, five pages by the author Frank N. Schubert which includes the statement in the original post in discussion
The Sioux lady exhibited an attitude of disrespect, dislike/hatred, and intolerance to the persons she encountered [as well as to what she thought were their ancestors]. If she were to be as big a person as her mouth is, then, in my opinion, she would have exhibited her knowledge of history by acknowledging the historic context in which the site was being visited.
My answer , a more proper place to visit rather than Lincoln’s grave or Wounded Knee cemetery might have been the “Buffalo Soldier Monument at Fort Leavenworth, Kansas”
The lady wasn’t the tour guide so it really wasn’t her responsibility to determine what was appropriate for the tour, however she had every authority to determine appropriate conduct at the hallowed ground of her ancestors . A few links on gravesite etiquette:
This next link has a relevant “step 3”
Confederate Flags in heritage cemetery?:
Final link regarding a view about etiquette a Shiloh National Military Park:
I won’t discuss the rest of your opinion, I'm already familiar with it from other discussions, but I would like to demonstrate how historical discourse can vary;
1.,“BUFFALO SOLDIERS & INDIAN WARS
"…It is this author's stated belief, that the Buffalo Soldiers did not mistreat Native-Americans and were not responsible for their removal from reservations….”
Copyright 1999 Stanford L. Davis, M.A.
2.,'Chapter 3, The Cavalry and the Indians, 1875-1878 pg.52
…Clum…decided to remove to San Carlos all the Warm Springs Apache,…
leading to a period of considerable conflict between Indians and the army in New Mexico Territory in which the troopers of the Ninth Cavalry played a major role.”
Billington, Monroe Lee, “New Mexico’s Buffalo Soldiers 1866-1900” University Press Colorado. Niwot Colorado, c. 1991