Again, governments do not have rights - people have rights.
In Maryland, the DNR Natural Resources Police initially encrypted all of their channels when they joined the new statewide FIRST system. However, they are one of the agencies responsible for responding to emergencies on Chesapeake Bay, and could not effectively interoperate with the various county fire department and Coast Guard boats that also have rescue responsibilities in these waters. So the NRP changed their operational policy and reverted to unencrypted comms on their main operating TGs, while retaining encryption on their tactical / investigatory TGs.
In DC, the fire department decided to - with very short notice - encrypt all channels. This change required 8 surrounding jurisdictions to install encryption keys in literally tens of thousands of radios to enable mutual aid responses into the city, which happen on a daily basis. Let's just say that people were upset. The fire department was soon forced / ordered by the Mayor and City Council to revert to open comms on operational TGs when it became clear that its justification to encrypt was not based on security concerns, but to avoid embarrassment (there had been several incidents that came to light by various groups that had access to the open comms.)
So, decisions / policies can be reversed when it becomes clear they adversely affect operations, or are shown not to have been justified.