Re: Please help me explain the logic
This passage is directed at English speakers.
Don't return your foreign language materials. Continue to learn other languages. Others will appreciate that you made an effort to learn their language -- particularly because the dominance of English means you did not have to. You can use English almost anywhere, but by making an effort to use their own language, you will make a good impression.
PS - Welcome to Using English.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.