The problem is that most races joined the horde but the horde always have been orcs. Right, Thrall formed a new horde. But he formed it from the orcs that were stranded on Azeroth. The word horde always meant orcs.
The tauren tribes joined the horde after the orcs came to the rescue when they've nearly been extinct by centaurs.
The darkspear trolls joined the horde when the orcs came to the rescue when they've nearly been extinct by murlocs.
The forsaken joined the horde when they found everybody was trying to put them down and they needed some allies.
The blood elves joined the horde when the alliance threw them out and they needed some allies.
The goblins will join the horde when the survivors of Kezan will be attacked by the alliance and need some help to survive.
You see? No one ever helped the orcs. They always managed to go on by themselves, even when they have been defeated and imprisoned by the humans. As soon as they gave up the demonic powers and their shaman powers returned, they became strong again.
Is it so strange that Garrosh sees all the others as weak? But don't get me wrong here. I'm not defending his actions. Thrall leaving and putting Garrosh in his place is, as you can clearly see, an error of epic proportions. Unless Thrall knows something nobody else does.
Thrall fought Garrosh for the horde leadership when WotLK was introduced and this fight was interrupted and never been fought to the end.
What did Thrall learn in Nagrand, that changed his mind? I mean, first he was ready to fight to the death to keep being warchief and now he simply claps Garroshs shoulder, offers him his seat and goes away?
How I hate to not be able to see what is going on!
