Spoilers abound.
They might be more sympathetic now, but their actions are still entirelly unjustifiable
(and even among the Ancients that manner of thinking was considered objectionable too - it's why the 14th member of the Convocation resigned in disgust, a person strongly hinted to be us, and the one responsible for summoning Hydaelyn as a counterweight in response).
The Ascians just come across as being stuck somewhere between Denial and Bargaining on the Five Stages of Grief (grief over the loss of their original world) - they stubbornly refuse to accept their world and loved ones are gone, and are doing everything they can to try and get it back, even at the cost of sacrificing others in the process.
We however are at the final stage of grief: Acceptance, we accepted the old world is over, that a new one has risen from the ashes, and are defending the right for the 'new' life that formed on this new world after the Terminus to exist in peace and with freedom of will to choose their own path, life that is destroyed constantly every time a Rejoining happens (when a Shard is sacrificed to the Source), and which all life would eventually be sacrificed once the Final Shard is Rejoined to allow Zodiark to be fully reborn.
The Ascians are stuck living in memories of a long-gone past that can never return (look at Emet's self-indulgent reconstruction of Amaurot, a reconstruction he outright admitted he went overboard with in the details). The world however has moved on and thus this world now belongs to the new life, which we represent and, as the Warrior of Light, protect and defend. Life that the Ascians don't even regard as 'life' (witness Emet's little racist rant about the residents of the First being "mere halfmen" (to use his words), and that although "we tower over our lesser kin", we're still just a convinent tool to further his own ends at best and an empty shell at worst to him - hence his attempts to turn us into an 'instrument of destruction' by allowing us to be turned into a sineater simply to put the 8th Calamity/Rejoining back on track.
So again, although they are not without sympathy, they are still however the enemy of life. Their actions result in the loss of countless lives and their plan threatens the very existence of Hydaelyn as we know it. So they will remain the enemy of life, the enemy of our star. And thus we will have to resist them, every single time.