What about Japanese shows?
For example: Bakemonogatari was aired in 2010. It is available in DVD in Japanese (maybe Korean/Chinese). In 2012 there is still no official English/Spanish/Russian/other release.
But there are a lot of fan translations. So, piracy is only way.
The concept of releasing in different parts of the world at different times is outdated. Release worldwide all at once.
But it's not that simple. HBO isn't a worldwide network. They need to make deals with lots of different networks in different countries and that takes time. Those networks then need to fit the show into their schedules.
National networks are similarly outdated. This is the 21st Century, for crying out loud.
If a bunch of kids can propagate high quality 1080i/720p copies of television broadcasts around the world literally within half an hour of the show airing in its native market, the content owners themselves can manage the same.
That doesn't make piracy OK, but it certainly makes it a lot easier for many people to justify.
How moral is it for someone in one territory to buy from a different territory? Because, to the business, that's just as bad as pirating. Which is why you can only change the region on your DVD player (Apple, MS) 5 times, and why there are laws preventing shops telling people how to make their DVD machine region free.