Is this guy even serious?
Garrosh spent an entire EXPANSION fighting a dragon that was driven mad by Old Gods just to...dig up a juice box full of Old God purple drank in Pandaria and take a BATH in it. If that's not turning your back on what you used to stand for, I don't know what is.
The Hellscream line isn't really well known for making good decisions, however. They're tough bastards but rather stupid.