The difference is the Red Wedding worked. It pissed some people off, but on the whole they were leaderless and not a real threat. This would have all of Westeros jumping him, because it's not only a tremendous breach of law, custom and the tenets of the faith, but an existential threat to the nobility as a whole.It seems in character for Tywin Lannister. The man is someone who would go to great lengths to prove his strength in a desperate situation. His father left quite the scar for such a proud man. Pride is his folly and considering the Red Wedding...well I wouldn't be surprised if he did do this.
The Lords across the rest of Westeros cannot allow for a Lord Paramount mind-controlling his vassals, because they would surely be next.
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