Now, the Horde was in front of the Alliance by getting there first. So in a way Alliance was behind again. If Anduin and his people were there first that would be they who started doing something. Not saying the Alliance didn't start attacking first technically(if it starts the actual war is at this point debateable, but I am sure the Battleground will be the base for the start of the conflict).
So you could say the Alliance started first, and that is fine, because that's the way the Alliance quests start, since they are the ones who technically attacks first.
And just to note(not towards you spesifically) in Warcraft, goblins who is mining shit like Azerite is not civilians. No need to stretch that. I believe the goblins whos there in Silithus doesn't actually know what they are mining, but they know the are mining some heavy stuff for Gallywix. You can compare this to an old vanilla quests were Horde kill dwarves to make them stop digging, though the magnitude of that might not be comperable. Civilians in Warcraft does not go around and mine shit from the wounds of the World, coincidentially where Sargeras just struck his sword.
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The queen of the Valk'kyr is enslaved to Odyn. If you did the mage tower quest where you learn about Odyn murdering Skovald's family, learn about background of Helya, etc Odyn isn't exactly a "good guy". What is the difference in Odyn having Val'kyr and Sylvanas having them? They are both flawed characters that want to use Val'kyr for their own ends. Odyn wants to create an immortal army to fight for him. Sylvanas wants to increase her people's population to defend the current population and bolster the ranks of the Horde. Why is Sylvanas evil for creating an army and Odyn not evil for creating an immortal army that eternally serves him? The Valk'yr would basically just be trading one for another. Only difference is Odyn is yellow and Sylvanas is purple/blue.