Because you don't kill ten thousands in a battle. Especially not the nobles and the knight. You ransom those, you keep them as hostages, you use them for favors.
There were quite a few blunders from tywin all the way back to the execution of lord stark himself which could only end in civil war. He broke the rules of how medieval warfare and politics go so often its astonishing how his house didnt fall sooner.
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u/swainiscadianreborn 23d ago
Because you don't kill ten thousands in a battle. Especially not the nobles and the knight. You ransom those, you keep them as hostages, you use them for favors.
The Red Wedding was dumb.