He's not wrong about the past and he doubts he's wrong about the present, but he bites his tongue before saying it out loud. Sniping loses its effectiveness when you're at a disadvantage--and in this moment he's painfully aware Cullen knows more than he's letting on. An annoying disadvantage.

"Hm, it's a stretch to see you responsible for all of this, I'll give you that. Magic closets seem like a punishment for you, not devised by you. But I don't recall you asking for help so much as demanding it. I believe the word 'chaos' was used. Would it kill you to use a 'please'?"

It's possible Anders' fondness for hyperbole is working double time. Truth be told, Cullen had asked before whipping out the condescension, but Anders had been too surprised and wary at his sudden appearance to believe the request genuine. Reconsidering their exchange in light of the new information he's gained and thinking he could have... maybe... possibly... read the situation wrong is something he's not sure he has the intestinal fortitude for.

Just because he isn't the public enemy at the top of Cullen's to-do list now doesn't mean he wouldn't find a way to trip him up later. You can take the boy out of the Templar Order, but can you take the Templar Order out of the boy?