I do some work for gov website that is more or less a PR blog.

Although you can't do anything to the systems that this agency deals with via the back end to this website, the scope of abuses that someone could engage in if they had these credentials is quite broad, ranging from "Agency XYZ endorses PQR" to "Agency XYZ will begin action against LMN".

Or, if you can't see the implications of that ability, consider that there's an entire cult of folks in the US that has some pretty questionable beliefs based on the mere assertion of "clearance" by an anon poster on a chan board... imagine how damaging it would be if those assertions could be "demonstrated" via an agency account?