The reformers who wanted to help immigrants assimilate and succeed in American culture knew that learning English was key to their success in American economy and way of life. Americanization efforts also included instruction in US history and the way democracy works in the United States.
They were helping people learn a new language because it would help them and give them better opertunties to get work and understand people around them. This was very important for them because without learning a new language they could not speak to the people. I think it's very good they learned a new language