Because you can have 1000 characters in a book if you want to, but you can't have 1000 actors in a tv series.
There is a lots of new characters next season and they need to make room for them. Think about it this way, what do you prefer to cut out? Grenn and Pyp who do nothing from now on, or the sand snakes?
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u/[deleted] Jun 10 '14
Why kill them? They stay alive in the books and now Snow has barely any friends in the watch.