And where have I disputed that part of the Wrathgate incident?
Except Theramore was never neutral, it was only pro-peace. What was neutral, was Dalaran at the time. Jaina became its leader after Theramore's destruction. And as such, became neutral. She even assured the Council she'd abide it and then told Anduin that when he visited.
The Horde can't break neutrality when they are the goddamn belligerent. Sunreavers could being a part of a neutral faction. Except the theft of the Divine Bell happens after Jaina already started personally aiding the Night Elves against the diversion Horde force besieging Darnassus. So while Sunreavers broke neutrality (well, technically there was only one Surneaver agent and Aethas being threatened into submission with the fate of his entire race after the fact, when he walked onto the scene), they did so only after Jaina. Which was the entire point.
Attacking a third party isn't a war crime. It's simply a start of another war.
Trolls still had a world-sprawling civilization before humans were even a thing. And every Troll patch in existence? The very first one was Trolls vs Trolls, with the issue being more about Hakkar than the Trolls themselves. The 4.1 patch was also more of a preemptive strike (also led by Trolls). And those who follow the Light aren't exactly the Light. They are its followers.
Except it's literally the other way around. Jaina didn't inform the Horde in the slightest and instead hoped for the best. The Horde sounded a horn at the Broken Shore. And you can see the Legion spaceships that forced them to from the Alliance's position.
Except Varian realizing the Horde doesn't control Undercity anymore is one of the two reasons he attacked it. And just lol at this double standard. Legion-aligned undead aren't Legion-aligned undead in the eyes of the Alliance, but Ragnaros-aligned Night Elves have to be Ragnaros-aligned Night Elves in the eyes of the Horde. Because consistency.
The Legion wasn't party to this war. It was declared by Varian as an idiotic reaction to the actions of the Legion and Legion's followers. It's still on him. Varimathras didn't posses him and force him to utter the words he said.
It's still the same Alliance, whereas the New Horde is specifically New. And I'm not sure how your comparison is supposed to work. The Alliance under Garithos burned the Blood Elves, this being the latest faction-burn they experienced, so when they looked for a faction they decided against the Alliance. Besides, the second betrayal was committed by the Alliance as it is now, who sent saboteurs to Quel'thalas under the guise of diplomacy. And I literally said they withdrew from the Alliance, so I'm not sure how I am forgetting that.
The only people having a claim in a monarchy are the relatives of the monarch. Which in this case is Calia. And those who actually fought for Lordaeron were either Garithos' people or the Scarlet Crusade. Both kinda dead. The remaining survivors are those who fled.