Our world also doesn't have healing magic that can literally bring people back from the dead. So it's a moot point. Maybe that refugee will find someone who can heal their brain, possibly a priest, or a paladin.
Alleria Windrunner is one of the most important leaders on Azeroth.but Alleria isn't anything close to the US President.
She is the leader of the Ren'dorei (a playable race of the Alliance and one of the three main Thalassian factions), she appears to be Vereesa's superior (Vereesa is the leader of the Silver Covenant, the strongest Quel'dorei faction on Azeroth, and the second of the three main Thalassian factions), and she is also the wife of the current Regent of Stormwind and Lord Commander of the Alliance Forces.
In-game Alleria can be found in the War Room next to the Throne Room of Stormwind. Meaning that she plays a vital role in running the capital of the Alliance and, indeed, the entire Alliance.
One would have to be pretty stupid to spit on such a person, but it's alright, because the subject in question was clearly not presented as a rational individual. Since it was a Sylvanas loyalist
And, by the way, let's see what would have happened if they spat on Garrosh, Sylvanas, Arthas, or Gul'dan, something tells me that the whole story wouldn't have ended with their friends and families receiving food and blankets from the victim (of the spit).