It is however specific about the locations and progression of the campaign itself. The Dalish account is "All was well, and then the Fire Nation invaded."
According to the Chantry historical account of the Dales, "And then came an attack by the elves on the defenseless village of Red Crossing. The Chantry replied with the Exalted March of the Dales, and the era of the elven kingdom came to an end. Halamshiral was utterly destroyed, the elves driven out, scattered, left to survive on goodwill alone." As you can see, it's not that nuanced about the campaign; both the Chantry and Dalish version of the Dales have an issue of brevity, most likely due to both of them serving as codex entries and not literal historical accounts that can take the time to address these kind of details.
Assuming that even happened. Which again, is a big assumption. A defensive action would have been to shore up the couture's borders, not destroy cities and burn half the countryside on the way to attack the capital of the enemy nation. That goes beyond defense. I'm not sure why what the protagonist thinks would be relevant to this discussion.
It's an assumption for either historical account, as no developer has clarified which historical account is the correct one. Either the Dalish attacked Red Crossing in an unprovoked attack, or the Dalish retaliated against an enemy incursion into their homeland that threatened everything they worked so hard for. You and I clearly aren't going to come to a consensus on the matter.
As for the elven Inquisitor, I think the protagonist could speak about the Andrastian incursion of the Dales when visiting the Exalted Graves, given that his ancestors may be among the men and women who were buried there in defending their homeland. It's a historical site of great importance in what was the former homeland of the Dalish; I'd be surprised if it didn't come up.
I just want to see the Dalish's smug sense of superiority taken down a few pegs.
Living a life of hardship, dealing with dangerous Andrastian outsiders who constantly pose a threat to the clan, defending against potential templar attacks, having to be on the move to avoid violent confrontations with Andrastian humans, going through a painful ritual to have valalslin marked on your face to mark your rite of passage into adulthood, and the myriad of trials and tribulations that the clan and the people have to endure doesn't come across as smug to me. The Dalish elves refused to surrender their culture or their religious beliefs, and I don't think that warrants being taken "down a few pegs".