I'm kind of hoping at least one PC will respond to the giant golem hammering his fists into the earth and invoking a shockwave of creation magic. If I have to NPC it, it's just such a waste. I'll use Wynne, maybe, if no one responds. 

Remember the whole idea of the Grey Wardens is that they do what works. Everyone else is caught up in culture and history, but the Wardens will do whatever they can that works. The rest of Ostagar see this golem as a menace, something to be feared, but the Wardens should see him as a tool, something which can be used against the Blight.