So if someone just stabbed you in the back 5 minutes ago, you would be able to forgive them for it? Their family and friends insist on a set of lies to paint you as the bad man, you'd just be able to forgive them in just 5 min?

Keep in mind that not all dragons did are in the war. It's only Nidhogg's brood. The others are just apathetic to whether or not Ishgard is razed to the ground.