How exactly are missionaries going to conquer the Dales Lob?
I'm not even going to pretend that sending religious soldiers to trespass into the lands of a neighboring kingdom is defensible.
It wasn't the orlesian military that went into the Dales with the missionaries, it was armed escorts. .
They were the militant arm of the Andrastian Chantry, charged with bringing in free mages into the Circles, and they were sent into a nation where mages aren't controlled by templars. It's a recipe for disaster.
I swear, it makes sense and I don't begrudge them being just as intolerant as everyone else on Thedas, but you flat out can't admit the Dalish have any personal failing that all the other mortal races on Thedas have. I am not condemning them for it, it makes perfect sense.
I've addressed time and again when Dalish characters have had flaws or made mistakes (like Zathrian, Velanna, and Marethari), but the Dales wasn't under any obligation to let in Andrastian missionaries into their borders or armed soldiers into their lands, and the entire situation is colored by how Drakon formed Orlais in conquests to build a nation under the worship of the Maker.