Hullo, fellow Warcraft Lore researches, contributors, arguers and fans alike :)
I wrote about this a couple of days ago, in a wrong place as i see it now, in the alignment discussion page to be exact... The question is, were Kaldorei in their majority an evil, neutral or good race? Undoubtedly, a whole race cannot be 100% lawfully good nor can it be oppositely 100% chaotic evil, for an exception to the rule is always a possibility. But nevertheless, if cultural, religious and even philosophical racial mindset are are taken as consideration, a single form of a whole race might open before us, and in case of this question, it would be the solid outlook at the kaldorei as one. We do know that the kaldorei might have worshiped Elune long before the discovery of the Well of Eternity and the wake of their mighty empire, and that even before these events they have sought to follow her example and deeds. Judging by the fact that the kaldorei have revered her as a "true" goddess and believed in good, it can be assumed that they were at the very least of chaotic good alignment themselves, or are these conclusions wrong?
Of course we also know that with the coming of Sargeras and the Burning Legion, many highborne kaldorei, being corrupted by the Dark Titan and the energies of the Well of Eternity assisted the demonic force in the invasion of Azeroth, but they were merely one caste although an influential one, which was still one of many other groups. Besides, not all highborne fought alongside the minions of Sargeras during the War of the Ancients, so in a way this even confirms that some kaldorei who were evil themselves and were part of the elite cast of hignborne which knew the power of evil and it's nature, abdicated it in a hard minute, however they still decided to use arcane magic later... This doesn't necessarily has to proove anything though, as those highborne who went against the demonic will during the War of the Ancients could have done so not of good motives, but rather of fearing the uncorrectable.