I agree with what you say and have your point taken on the copyright act. I will look it up, as its ultimately important to us doing biz here.
Its true I don't have a law section to offer here, but my points come rather out of experience in the industry and not "book" knowledge. Which is also important i believe.
Its not just a mere "opinion" and I like to get to the bottom of this.
Fact is that we have contracts with Corbis & the Lonely Planet Library, as well as other clients which require Model & Property Releases. I also worked on projects in Australia which required to check on this matter. In fact in Australia exists even a Landmark release for places like the Ayers Rock or the Sydney Foreshore Area. This things may not be stated in a "general" copyright act but special, sometimes local laws apply.
Again I'm not having the lawyer background on this, but in fact have been working on projects as a professional photographer in my career colliding with this requirements in Australia in this case. So, its not made up... or just a moral opinion. My statement might have given that impression earlier.
Some laws apply on the mere act of picture taking, others on the specific usage of the images.
EG. in Australia is also a Child Protection regulation in place, so although model release may not be require in specific usage situations, you would still be on slippery ground, because you are essentially not allowed to take the pictures... In fact I was questioned by police on this when I worked on a book project.
As for the USA and property releases required?
There is a reason that the big libraries (even in Singapore), ask for Model and Property releases. I agree however, that it could be because many images are used globally and the rights have to hold up in each country.
At last i like to say, its not about finger pointing here. The questions to this answers are essential to do successful business and its a big difference if you work as a wedding photographer here in Singapore where local law applies, or like we do, on commercial and library photography shot in the region, but with a world wide audience and its usage requirements.
cheers
felix