The USA has historically had no official language. Spanish is also the second-most widely spoken language here after English.
It's not about representing a "well-integrated subculture" (which sounds gross to me btw) but pointing out that this country's identity is and should be about more than White English Speakers.
You're saying this thing should pander to White America when we can see all around us the results of that attitude. Inequality and hierarchical oppression.
The show had subtitles in English. Presumably also in German and other languages. You can read them.
Fuck's sake man.