Who expressed the idea that Navajo is of no use at all, emphasizing the importance of English for success?

The idea that Navajo is of no use and that English is essential for success was expressed by Principal O'Sullivan. This character represents a perspective that devalues the Navajo language and culture. By emphasizing the need to abandon one's native language in favor of English, Principal O'Sullivan reflects a broader historical context where indigenous languages were often seen as obstacles to integration and societal advancement. His viewpoint highlights the tension between cultural identity and assimilation during that period, which is a significant theme in discussions about the impact of colonial attitudes on Native American communities. Other characters may offer different views and perspectives, but it is Principal O'Sullivan who explicitly conveys the belief that proficiency in English is crucial for achieving success, thereby underscoring the detrimental effects of such beliefs on the preservation of Navajo language and culture.