Why can't we download free apps from every region?

Question

Hello all,
I am trying to get the full version for angry birds free, I know it is available to download, however when I do a search in the app store I can't find it.
When I do a search on google, I can find several links to download it, but when I do, I get a "this app is only available in the US store" error.
I don't understand why this happens in the first place, it are free apps, I can download them to my pc, android users can download them without any problems, so why can't we?
As for all the discussions about needing a different credit card for each region is a load of ********, excuse my language, a visa card or any other credit card is made for international purchases, that is the whole reason people get one, it makes no sense why apple is being so anal about it, or do they like o annoy people who spent a lot of money on their products.
Android is gaining on them and pretty soon a lot of people will change to that instead of an apple product unless they get their act together here.

Answer 1

@Demo:This is my first apple device, so I had no idea about those limitations, I knew I could not install Magic 2013 on an android, that's why I chose to get an ipad.
I just think that if enough people actually bother to complain instead of just letting people/governments/companies walk over them, they will actually care what their consumers want/need, that's probably just wishful thinking on my part.
@snozdop: funny you bring up the heinz reference, baked beans from heinz haven't been available in shops here for the last few years, but those are cans, need to be imported and that involves transportation etc. etc.
I am just talking about a digital app, available on the internet(world wide web) limiting regions completely destroys the point of having global internet access.
I'm a dreamer, hoping that most people are still good, probably my mistake for believing in that.