The best part of the Overwatch story is that after the robot uprising and all its "atrocities" on "both sides" they needed somewhere to put them all.

So they forced everyone out of Australia and gave them their own free country for all robot kind. The Australians of course didn't like that and most became outlaws and terrorists constantly attacking the new nation. Its just Junkrat/Roadhog are what they are.

I'm sure you can see the real life parallel in that little background lore and how wild it is that they did it. Double so that one of the original missions has the payload you are escorting be one of those terrorist attacks (a giant EMP that detonates at the bottom to kill all robots).