Good point. I failed to qualify what I meant by freedom of expression, and made a meaningless claim regardless. Despite the US Constitution's relatively broad speech protections (e.g. don't criminalize hate speech, and allow truth as a defense to defamation claims), US governments don't always respect freedom of expression (e.g. KOSA would force social media companies to moderate more aggressively to "protect kids") or respect press freedom (e.g. police pepper spray journalists at protests). Even so, I think Congress wouldn't have bothered to codify fair use if the First Amendment weren't as broad as it is.
I replace the following sentence from my previous comment:
> Most other countries don't have freedom of expression and freedom of the press, so copyright law in a different country usually lacks a unifying exception test like fair use to supplement the specific enumerated exceptions.
with the following:
Copyright law in most countries usually lacks a unifying exception test like fair use to supplement the specific enumerated exceptions in each respective country.
The rest of my previous comment remains the same.