The three scouts’ narrative differed sharply from the accepted story, most markedly in their assertion that Custer had paused for 45 minutes on a high point on the bluffs, where he watched Reno’s defeat and declined to go to the major’s aid. Troubled by this account, Curtis consulted with President Theodore Roosevelt, who advised him not to print it. Curtis agreed and published instead a vague description of the fight, a confusingly marked map, and a few photographs, attracting little attention.
[White Man Runs Him] “I said, ‘Why don’t you cross the river and fight too?’ I scolded him. Custer replied ‘It is early yet and plenty of time. Let them fight. Our turn will come.’”
Why exactly did Roosevelt turn him down? According to the documentary, he didn't want to sully the memory of the "legitimate heroes of American history." In other words, he didn't want to harm his imperialist philosophy of white supremacy and manifest destiny.
Note: Some people say the scouts misremembered the events 26 years after the fact. That it couldn't have happened the way they said. I don't know enough about Little Bighorn to verify this.