The correct answer to this open question is the following.
Although there are no options attached we can say the following.
What the author thought of Native Americans is that Native Indians are primitive people that do not need to be alive in the American territory. That is a horrible sentiment that caused much suffering in his time.
Capt. Richard Pratt, said that quote in 1892, showing the way some Americans felt about the Native American Indian tribes.
Let's remember that in 1887, the US federal government had initiated an effort to teach the Indians the "American Way."
The purpose was that Indians could leave behind their culture, belief systems, traditions, and history, in order to be integrated into the institutions of American society. Of course, one of them, the school.
Many native Indian children were studying in boarding schools by 1900.
Unfortunately, Richard H. Pratt had a distorted idea of how to educate Indians.