Oh come on don't be dense, Alleria is still resentful of the Horde because her family was killed during the Second War, do you really think that's not something that maybe a lot if not most of the High Elves currently on the alliance share?
High Elves having a grudge against Orcs and the Horde for the second War is not a wild concept it should take you this much to grasp. It's the same reason why Blood Elves are pissed at Human because of Garithos, Both have reasons to hold a grudge, do you not realize that?
High Elves chose to not hold the whole of humanity accountable for Garithos choices.
Blood Elves choose not to hold the Orcs accountable for what they did during the second war.
It's not really that hard to understand.
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How about them false equivalencies tho? What an effing disingenuous argument you are making dear lord.