To clarify this, it isn't all Aboriginals, it's about 60 particular communities in the Northern Territory that have a rampant problem with child sexual abuse (and sexual abuse in general). This isn't particular to Aboriginals either, it is all people in that community. That means whites, including miners, will not be allowed to have porn or alcohol in these areas.
Many of these communities are already "dry" due to the local bi-laws, but because neighbouring communities are not, it creates a problem where people just smuggle alcohol in form out of town.
In short; Pornography and alcohol is accessible to all people of Australia outside of these areas and limited to all of them within.
I tend to think the government's action is heavy handed and wrong minded, but in the end, someone had to do something. If you've ever been to one of these communities (and I have), you'll know they can be incredibly dangerous places.
If you do read the full story, or have seen the full story as it unfolded on Lateline, some of the incidents involved are nothing short of atrocities, with children being rented out for alcohol and petrol. If it were a war zone, these would be heinous war crimes.
Lateline - ABC for more information.