Anti-terrorism in NZ and Australia

I have not made it out of the pacific yet and already have been "randomly" searched at airport security. Twice. Once in Wellington, having just said goodbye to my family, and once in Perth. After being forced to walk through the scanner at Perth airport security with my belt off (apparently I could be hiding my arsenal of weapons behind the buckle) I was asked by an official to "come this way please" because I had been "randomly selected for an explosives search". The first thing that ran through my mind was to make some sarky retort about it being because I am black (sort of), but the official was much blacker than I am, so I thought better of it. Can't help but wonder if this is going to be a common feature of my travels.