“OK, but who decides that?”: this is the liberal question.
Society should be just? Ok, but who decides what justice is? All people should be given an equal chance to flourish? Ok, who decides what equality is? People should be free within reasonable limits. Ok, but… People’s basic rights should be respected. Ok, but… Etc.
In the realm of liberalism, where assertions of principle are followed by the liberal “ok, but” questions are rarely answered; they are hammered out with the crucial but possible impossible goal of eventual agreement.
(Having goals is more important than achieving them.)