I think you guys are starting to "Lord of the Rings" this thing. It's an adaption. It's not a scene by scene play of the books. Clearly they are going different directions with characters and plot lines while keeping most of the major themes intact. And honestly, thats not only necessary but good considering they have to deal with the next 2 books and they are boring as hell on page.
Here's how this works: As they try to figure out how to condense something down from 8000000000000000000000000000000 pages and 9000000000000000 characters they have to cut shit. They have to narrow it down to a couple things. The universe in the TV show MUST be smaller.
Now, it can be argued that they aren't doing a good job of it, and thats totally understandable. While I thought what happened with Tyrion last night (all of it) was perfectly fine it wasn't as good as what happened in the books. I'm 100% with everyone on that. But from a technical adaption standpoint? It worked perfectly and it fit the arc they've created just fine.
EDIT: On that note, I realize that most people get upset when something love gets messed with at all during an adaption and that I'm weird in that I LOVE seeing how writers adapt stuff and the decision they make, even if I don't agree with it.