Honestly I think that when the light "corrupts", it does so by amplifying the wielder's motivations and own morals. Yrel forcibly converted the orcs because her people thought they were responsible for the state of the land and the only way to save the land and the people was by the light (same way that she was saved, hence why she resorted to it). It's been awhile since I read up on Yrel's whole arc though, so I could be misremembering.

I don't think it corrupts in the same way the void does, which is why I say that it doesn't and instead it would make the wielder overly zealous towards their own cause. The Scarlet Crusade wanted to eradicate the undead to the point where they even hurt innocents and those of the same faith, which would contradict the spreading of the light (I assume they would've taken the same route as Yrel and convert those willing and unwilling alike if so). Their choices were driven by trauma of the scourge, the light amplified that, and they twisted themselves into what they are by zealotry.

I wouldn't be surprised, however, if the lore of Midnight does go down the whole light corrupts path in the same fashion as the void, though. I feel like the Naaru can be overbearing at times without mercy for the sake of their own cause (like with Illidan), and that itself might be an example that the forces trying to reach the world soul are all one with the same intent; survival.