Drones downunder

Who are you going to shoot?

The air force is looking to buy armed drones….. I have driven around a lot of Australia and I read this and scratched my head… yeah, ok, drones are cool…. Armed drones could be cool…. but, who are you going to shoot?

Not only, but also… You would have to buy a whole lot of them to cover any sort of sensible amount of coastline…. A WHOLE lot of them….

I just wonder how an armed drone looked like a hammer for some nail to someone. What’s the nail that I am missing?
(Feeling very out of touch here).