"Protect their culture" is one of those phrases that raises alarm bells,
especially when it's being used by a government. We have a 1st Amendment for a
reason - because governments are not to be trusted with the decisions of what cultures to protect or not. In the specific case of France, all sorts of horrible shit was done in the name of """protecting""" their culture. There were several other languages[0] native to France that Francophones had themselves tried to wipe out[1]. French is not a language in need of protection, it is a brutal predator in and of itself. If English weren't there to keep it in check[2], it'd go eat all the rest of the languages.
[0] https://en.wikipedia.org/wiki/Patois
[1] https://en.wikipedia.org/wiki/Occitan_language#Preservation
[2] Similar to the concept of a keystone predator, see https://en.wikipedia.org/wiki/Keystone_species