The Alliance and the Horde are like polar opposites in a certain way - but one commonality is that both factions have been described as "families" in the past. I found this to be a really powerful and simple quote:
But according to this interview by Steve Danuser:Why are the Darkspear in rebellion against Garrosh?
<Vol'jin twists his face into a scowl.>
Ya wouldn't understand. What's de Horde ta ya, <race>? Diseased? Alien? Betrayers? Demon-blooded? Beasts? I know what ya say 'bout us.
I'll tell ya what de Horde is. De Horde dat me an' Thrall built. It be a family. When de whole world try ta put us down, de family come an' pick us back up.
Hellscream, he don't see family. Ain't never had one.
That being said, while the Horde story is currently one of deep division, Danuser notes that the Alliance aren’t at each other’s throats. "The Alliance is like a family. Brothers and sisters can disagree, and things can get heated, but there’s still a deep and abiding love and trust there."
https://www.polygon.com/2019/1/15/18...s-of-vengeance
The Alliance values unity, harmony, and cooperation - it is built on those who are drawn to each other based on similar values, people who are drawn towards things they are most familiar with, who are most like them. That is why the Tushui value harmony above all other values, and were drawn towards the faction in the first place. Why Varian declared that a bundle of sticks is not easily broken.
"Hm. I used to think that leadership was all about strength. I see things more clearly now - It's a little bit of give, a little bit of take. It's about binding people together. A bundle of sticks is not easily broken."
The Horde is based on differences - on diversity, on the outcast, the formerly oppressed and misunderstood, the downtrodden, marginalized and victimized elements of society, often ignored, shunned and neglected, who believe in compromise out of necessity, and the ends justifying the means.
"When will they learn? When will they see that the Horde exists BECAUSE of the Alliance? Because of their prejudice and their bigotry!? They force us ever closer to Hellscream's Horde."
In other words, what makes a true family, a real family? Those who are most like you, inside and out? Those who always try their hardest to carefully avoid fighting as best they can, and constantly strive for harmony?"We dark rangers were fiercely loyal to Sylvanas. We trusted her... followed her commands.
It is clear that our loyalty was never truly reciprocated.
Some of my sisters and brothers have chosen to remain at the Dark Lady's side. I, and many others, have not.
<Velonara's expression becomes steely. Determined.>
I refuse to be a slave to this torment. Both the sin'dorei and Forsaken are my kin. I stand with them, and with the Horde.”
Or those who are most different from you, and who fight with each other, and love to fight with each other all the time, because they believe it is actually conflict, the belief that most families are broken and imperfect and are supposed to be, and that it is our fundamental and individual differences, which define a family, NOT abstract things like the ideal of perfect unity and cooperation, or harmony and balance, whatever those are supposed to mean?