According to what I learned, the preposition 'for' changes the meaning to "It is important that all people are free", which is rather not the meaning of the Polish sentence.
Star341179. I agree. The gramatical explanation has no weight on the widely used used explanation as in this case "for all" means everyone.
Why not freedom is important for everyone why is dla read here as to and not for?
What is freedom? It is a hard question to answer. Everyone wants more freedom, but pure freedom is just anarchy. Complex philosophy here! :D
Not everybody wants more freedom. Especially as being free, having a choice makes us responsible for our choices.
Reminds me of an interview of a Cuban man that was given the barber shop he always worked at. He wasn't happy because he used to get the same paycheck from the government. Now he has to be more careful because some months he makes more, others less, and it is not as secure.