This isn't a defense of any character's actions in WoW or the story of the Warcraft setting.
The last time anyone mentioned Turalyon and Alleria, it was their son Arator back in The Burning Crusade's Outland.
In the past, we've already discussed which characters we'd like to see in Heroes of the Storm.
Some of us define ourselves by our successes.
The fallen Titan unleashed the Burning Legion and sent them across infinity, devouring worlds like cosmic locusts, rendering them lifeless. A nearly unstoppable army of demons under his banner finds worlds and unmakes them, and so far only one planet has held out against the onslaught of Sargeras and his Burning Legion. But who is Sargeras? What motivates this being? What drives him to seek the unmaking of the entire universe?
They are the last uncorrupted remnant of the eredar people.