The government would probably be happy to grant strong encryption licences for legitimate (as they would see it) business purposes
Except they can’t - because those “legitimate businesses” have to connect out into the potentially terrorist- or dissident-infested Outer World in order to function. How does #AUSGov know, for instance, that the Australian Bank doing wire transfers to a Bank in Iraq or Iran or Yemen (assuming there still is one we haven’t helped Syria bomb back into the Stone Age!), or even a Bank in the UK or US, isn’t funding…Terrorism??? How can OzReichsProtektorate (or whatever you call your version of “Homeland Security”) be sure business e-mails aren’t actually being used to send out messages to…Terrorists!?!?!?!?!?!?
Because rest assured, if I were a Terrorist and wanted to safely send out Secret Terrorist Communiques, the first thing I’d do is get a job at a business that had one of those exemptions from Australia’s “backdoor” law, and make sure the person I was communicating with worked for a “safe” business on the other side, so we could communicate freely…