My mother was born near Rome and didn't come to the United States until she was ten years old. She quickly learned English, she became completely fluent, and she spoke without an accent. But I wonder what would have happened if there had been a bilingual education program in place in the New York schools and she had been forced to participate in it. I think the answer is obvious: she would have had more difficulty learning English and she would not have learned it as well as she did.
And that fact would have impeded her assimilation. So why is there any support for bilingual education? It is a foolish idea on the face of it, and it harms those it is supposed to help.
Liberals don't understand the importance of assimilation. If they did, they wouldn't support programs that work against it. How can there be comity without commonality? How can there be social harmony with groups who refuse to assimilate, refuse to become Americans, do not share our classically liberal values, and are here only to exploit the economic opportunities that our country provides? Not to mention the jihadists that come here to destroy us, and are of course shown every consideration by the nimrods of the Left. Do I need to give examples? Not to anyone who has been following the news.
Now why don't liberals understand the value of assimilation? One factor is their fetishization of diversity, which is explained in Diversity and Divisiveness. Diversity and the Quota Mentality extends the thought.