First, I consider that, in the context of the high degree of racism in force at the end of the 19th century, he was a figure of great symbolic importance. Booker was an educator and was the first black man to be received by the US president at the White House for dinner. What's more, he became the president's advisor on the racial issues that bubbled up at the time.
Obviously, Booker unleashed the anger of supremacist groups and had to deal with racism. I believe that for the time, he had a pragmatic strategy, which was to invest in the emancipation of former slaves through education and encouragement to business, entrepreneurship, etc.
What I perceive is that in his view, placing blacks in positions that would contribute to the development of the country would be an attempt to elevate the morale of this group in a society completely hierarchized by the color of the people's skin.