The problem now is all the web apps, whether text or streaming, that have made it too easy for anyone to monitor. People show up at incident scenes and cause interference. The rule is: what we hear is for our ears and not to be repeated. That's been broken. The alarm bells go off for officials when someone is arrested and they have a scanner app running on their phone.
The move to digital technology has made things possible that previously were not. I can't imagine building a state-wide analog-based system. Mountains, microwave links and dead spots come to mind. With digital everything is data. Connections from one region to another can be via traditional, telco services or even the Internet. Not sure of the need, but it does make it possible for communication to be monitored/recorded at a "central" location. Adding encryption is just adding a software layer (which only has a one-time up-front cost).
While the Internet has brought lots of good, it is also being used in negative ways. ID theft comes to mind. Having PII (personal identifying information) just "out there", is not really a good idea. It might seem easy to switch to an encrypted channel when that type of thing needs to be sent, but it isn't. I've noticed over the past decade or so that when a major incident happens, it often takes over the main (dispatch) channel and the normal radio traffic is moved.
This move of everyone to this new state-wide digital system has been in the works for years. Those who are truly concerned about ability to monitor it should have been vocal (to officials, elected or otherwise) years ago. Now you have to play catch up.