Most characters are afraid of the WG's power lol. Its not a stain on Harald at all to be worried, especially when he has responsibility to make sure his people remain safe.
Elbaf has existed for 800 years without being threatened by the WG the entire time and yet suddenly Harald is now scared?
You haven’t been paying attention to this flashback
the giants aren’t scared of anything. Harald is being a bitch because he hates the violent nature of his own race and it’s passed
he’s being stupid because he thinks he can make up for “crimes of the past” by bowing down to the most evil entity on the planet that’s done much worse thing than the Elbaf giants ever have