At West Point, cadets study the military strategies of Robert E Lee and Stonewall Jackson, among others. Removing the monuments to these great generals will remove the historical context for these battles and strategies.
Besides that, another letter to the LA Times asserts that removing the monuments will enable Americans to “stop fighting the Civil War”. Well, the anti-Trump “resistance” is planning a summer of violence that might constitute a new American civil war. Are we to believe that the AntiFa insurrection of 2017 is our first civil war?
Unlikely. The cadets aren't in New Orleans or St. Louis and have more important stuff to do than take a trip just to see statues, so any effect would be nonexistent.
The context might include battlefields and historic sites, but not every statue located around the country.
But you do raise an important point: what will happen with the Lee and Jackson portraits at West Point and other military bases or with Confederate memorials at National Battlefield Parks?