You mean the ones that became today's Blood Elves? The bulk of the Night Elves fought against the Legion and their own corrupt nobles.
Ah, that meme trying desperately to shift blame off the Horde. "The intended victims of serial killers are responsible for anyone the killers kill! They should have just allowed themselves to be killed!" Do better if you want to be taken seriously.It was this invasion that made Sargeras meet the Orcish race in the form of Broxigar and is the reason the Orcs were 'recruited' / corrupted. Two can play this game, the Night Elves are the reason everything is f*cked. Or similarly you can blame the Draenei for leading the Burning Legion to the Orcish homeworld.