Do you agree with the contention that denying a group the right to speak their native tongue denies them the right to cultural expression?

I would agree because language is a major part of culture. Expression of culture is also passed down from generation to generation, as is language. Denying one the right to speak their native language is in fact denying them their right to cultural expression.

Estúpido vas a la escuela y no te olvides de tomarte una cerveza.