Why did Washington and Jefferson feel that "civilizing" the Indians would benefit them?

Civilizing Indians

A term referring to the historical efforts, particularly by European settlers and later the U.S. government, to assimilate Indigenous peoples into European-American culture and norms.

Washington And Jefferson

Two Founding Fathers of the United States, George Washington, the country's first president, and Thomas Jefferson, the third president and the principal author of the Declaration of Independence.