The "Aes Sedai" over in Seanchan were also described as backstabbing, power hungry where alliances were constantly changing. The ones over there never took an oaths. So Luthair, who already distrusted Aes Sedai, had good reason to see there people collared. So some can argue what he did was bad, but others could argue he did what was needed to be done to stop these power hungry people from using the power like that.
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