Dispelling a few misunderstandings (as an Aussie):
Last big Bushfires affected a relatively small area of a HUGE country, so unlikely to have any effect on future plagues (if anything, it might help the plague along).
The areas affected by the mouse plague are, again, restricted to certain parts of certain States (& Territories). So not everywhere. I’d have to drive days and days to see it from where I live, for example. It’s likely bigger news in the UK than it is in here, in States that are not affected (yet?!). So if you were appalled by the idea of mouse or snake plagues, you could live in lots of other parts of Australia in theory. Like millions of square kms.
Now consider whether ANY amount of natural predators (cats, birds, etc) could deal with BILLIONS suddenly-appearing mice? Just because you like eating doughnuts doesn’t mean you could eat 400 a day, am I right? 
Please don’t send us your spare cats, it’s the introduction of non-native species that got us into this mess in the first place. The mice arrived on the earliest European ships. Along with bugs, foxes, rabbits and others, causing us hundreds of years of huge headaches. Also, house cats are kept indoors on purpose here (by ethical owners) to prevent predation of native species (birds, reptiles and mammals). It’s a big problem.
Other than that, thanks for any sympathy you send our way... we do seem to have more than our fair share of natural and unnatural disasters and it must be horrible for the farming families going through this. Puts our new lockdown into perspective, for sure!