There are only four kinds of people living in the U.S.A.:
Native Americans
Naturalized Americans
Guests of the American people
Criminals
The kids who are not U.S. citizens but are here legally are guests of our country, and as such ought to be taught to respect our cultural traditions.
The kids who are not U.S. citizens and are here illegally ought not be in our public schools, but ought to be deported, along with their parents.
What is so difficult to understand here?
Nothing, but you are committing a no-no, you are thinking. That makes you a dangerous person who must be shouted down or silenced completely. You should be feeling, not thinking.
Just imagine yourself as a very young person from a totalitarian country and you are singing, or hearing, these songs with words like "freedom" and "liberty". How would that make you feel? Wouldn't you feel like a second rate person just because you are from a rotten country, something you had no control over?
No, you would probably feel exhilerated about these new concepts and delighted that you are in such a country. See, I knew you were dangerous! Regardless, these ideas must be stamped out. They are way overrated. Besides, it is something you need to be prepared to forget because your freedom will begone soon anyway, if we have our way.