The Berne Convention only took effect in the US in 1989, well after Victor Hugo was dead and quite thoroughly decomposed. (I mention the US because the Internet Archive is in the US and subject to US law, as is the Author's Guild. The National Emergency Library is tied to the duration of the US national emergency.)
The idea that the majority of people in the US are dissatisfied with the 1989 changes to US copyright law is a pretty strong one, and is at least nominally at odds with the fact that it finally got passed after a century - how did it finally become time to pass it if people were against it?
(Take care to distinguish opposing the law from being indifferent to it - certainly there are many laws that do not affect me that I'm indifferent to, such as the Railroad Retirement Act of 1974, and even if the majority of the country feels as I do, it would not really follow that that law is illegitimate.)
Yes, it's a serious problem when there are laws that the majority of citizens find illegitimate - but the contrapositive of that is that most of the time the default assumption is that for any given law, it probably is legitimate.