^_^My Inquisitor is a pacifist, but like the Romans said: ''Si vis pacem para bellum''.
So no a naive pacifist, but a wise one. He has built diplomatic relations with Nevarra,Ferelden,Orzammar and Tevinter..for a strong ,prosper and balanced Thedas.
He get Gaspard killed because was a brutal warmonger, unmanageable and Dangerous.
While Celene liked peace and economic prosperity. Plus, with Briala by her side:
1: Celine is more malleable...less ardened and cinic, more open to..suggestions (you know..gratitude, and the Inquisitor is powerful...king Alistair's gratitude and friendship, Nevarra's and Tevinter's gratitude as well... and the Chantry depends on him... )
2: like the mage rebellion teaches, it is time to reform Thedas, not only with regard to mage conditions but Elven population as well...or another Dangerous civil war could weaken all the Thedas with serious consequences...( the Qunary are always a threat). and Briala could ensure this...but only if counterbalanced by Celene(as empress and lover...) 