If you declare freedom or liberty to be the highest good in society and that securing these things is the foundation upon which the state’s legitimacy rests, then do not be surprised when your country slowly transforms into a Progressive dystopia over time.
What happens when two people clash over the definition of what constitutes liberty or freedom? What happens when millions of people disagree? Or half the country?
Liberalism has no metaphysical foundation to adjudicate those disputes because it already declared and so over time it MUST expand the definition of liberty to mean not only freedom from coercion, but also freedom from ALL forms of arbitrary power and unchosen obligations imposed upon them.
What this means in concrete terms is that we eventually end up with a never ending list of “rights” the state must secure in order to ensure that everyone is fully liberated.
This is how we ended up with Women's Rights, Worker's Rights, LGBTQ Rights, Immigrant Rights, Indigenous Rights, a Right to Housing, a Right to Healthcare, a man's "right" to be called a woman, a child's "right" to mutilate themselves, a refugee's "right" to enter our country and collect welfare, and so on.
Not all Classical Liberals voted for these things or have a problem with inherited obligations like tradition, family, religion, or the nation. But someone eventually will. And they will appeal to the Classical Liberal's own internal logic to demand liberation from the very things that Liberalism itself cannot truly justify.
What began as a rebellion against very legitimate and blatant examples of tyranny, such as a cruel king or vicious dictator, now ends in a rebellion against the "tyranny" of international borders or “assigned sex at birth."