Yeah, I remember that but there is more to it. Its completely unheard of and will shame his family and name. There's a few things they left out that I wish they put in but I get it.
The reason I said I wish they went in more depth for the non readers is because Ive read some things from viewers complaining that Robb was an idiot to think nothing would happen regardless of what Frey promised etc.
Anyone that doesn't want to read the books I still strongly suggest you guys read the RW chapter. I think the show did it well enough but the book blows it away. I can understand others being underwhelmed. Although I must admit its pretty damn hard to live up to.
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Yeah, the lack of explanation and further developing of the "rule of hospitality" is my only major gripe with the show's potrayal of the Red Wedding (there are others, but those are mostly minor nitpics, having more to do with personal imagining of that particular scene). They had many occasions throughout the three seasons to flesh it out.
I see two reasons why that theme was important.
One - it would explain why Robb wasn't a fool to try and trust Walder. It explains why ultimately he led his guard down during the happy events of the wedding ceremony. Reading the comments from the fans who didn't read the novels, it seems like some of them think that Robb "had it coming".
Two - and this one is a bit more important in the long run. Without it, it changes the nature of the whole Red Wedding. In the show, what Walder did was simply a horrible, violent, brutal treachery. But in the books it was a little bit more than that. It represented the shredding of tradition. The law of hospitality was more than just a normal custom, it was considered a sacred rule, one that even mortal enemies, or people at war with each other, would never dare to break. To do so, would mean to be "condemned before the eyes of gods and men". Breaking the rule of hospitality in such a perfidious, horrible manner, showed that this war has got to the point were there are absolutely no rules at all, no things are hold sacred anymore, no pretense of respect is shown, and its so ugly that even the "traditions of warfare" that everyone before complied to while killing each other, are now worthless. It was one of the ways to show that the world is changing before our eyes, which is one of the recuuring themes of Martin's ASOIAF books.
The good news is that there is still a chance, that they will touch up on it later. The preview for the next episode showed Tyrion talking about the events of the wedding. Perhaps it will be a chance for the creators to put some exposition dialogue, that would further reflect on the meaning of what Walder did.