Sure. But in my country there are very few guidebooks I can buy about any other country - I would have to go on the internet and look for a book to order in, or find my info online somewhere. Not every guidebook ever written is available everywhere, and not every guidebook addresses every possible thing. If you came to visit my country, I'm not sure you would learn everything about our culture here before you came. Even if you did a lot of research, you are likely to miss something. Tourists very often do inappropriate things while they are visitors to my country, and I understand that they aren't doing it deliberately to offend. Personally, not much offends me - but there are segments of our population who do get offended by what some tourists, many of them Americans, do.