You know, as much as I hate to say this.
Thrall is right.
Garrosh chose to side with the Dragonmaw orcs.
Garrosh chose to use the mana bomb on Theramore.
Garrosh chose to do everything when his peers started advising him to stop.
Garrosh chose to do everything when his peers started to force him to stop.
Garrosh chose to use every single thing we fight against in the Seige of Orgrimmar.
And then when he was put on trial and found guilty, Garrosh refused to take responsibility for any of it, and ran off to re-live the “glory days” of the Horde.
Thrall left Garrosh in charge, but Garrosh is the one who chose his own actions after that. It’s not like Thrall was controlling him from behind the scenes, he was too busy trying not to spend money on Journeyman Riding.
Also, for tirade in the middle of the fight: Let’s not forget that Garrosh is the older one of the two.