Erm, no. The Scarlet Crusade nonsense really shouldn't be taken seriously. It makes no sense whatsoever. The Scarlet Crusade is functionally no different from all of the other templar orders in Warcraft, be it the Silver Hand, the Argent Dawn, or the Argent Crusade. They're all Light worshipping military orders made up of EK races that crusade against the Undead. The only difference between the Scarlets and the Argents is that Blizzard arbitrarily decided that the Scarlets are mob fodder while the Argents aren't. This creates a huge plothole in the lore, because in the Tirion Fordring short story, he couldn't use the Light when he believed he had violated tenets of his faith. If that carried over to WoW than the Scarlets would have no powers whatsoever. It's contradictory canon that cannot be reconciled at all because it just wasn't thought out, and it should be disregarded.
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When did that happen?