I'm at the bank in chapter 3 and i'm of two minds, usually I go my own way to meet Yaevinn and try to talk him down, but his speech about Aelirenn and martyrdom rankles me. Thus in rejecting him I side with Siegfried to avoid the greater evil.
But i've been taking my time in this playthrough, and investigating every nook and cranny, and it's fairly obvious that the flaming rose is conspiring with Adda to overthrow Foltest. The forged seal, DeWett trying to usurp Thaler, armourers being forced to give away free arms etcetera. The clues just keep mounting up and then Thaler states at Leuvaardens party that someone in the room is backing the amphibians.
My Geralt believes that it's Adda, how else have they become such a power in the city, virtually ignored by the guard (outside Vincent) and terrorising non humans and humans freely.
Given these thoughts circling through my white wolfs mind, can he trust his safety and the secrets of Kaer Morhen to a knight of the order who may be unknowingly in collusion with the enemy. It would seem to be a cunning stroke to turn the enemies allies against them, but Geralts life and the Witchers secrets hang in the balance. It is a very risky move.
Also I would not be choosing to aid the Scoiatael, i'd simply be using them to achieve my goals, as I admit to myself when Triss asks me why I decided to stand with them. I like this answer because Geralts hides the truth from Triss, suggesting that he's not entirely forgotten that conversation with Philippa at the beginning of the chapter. Yaevinn it has got to be said also seems a lot more cunning than Siegfried, an alltogether more formidable being, both in terms of brains and actions.
But then again turning the enemies strength against themselves is the wise warriors way, and Siegfried is both strong and good. A shining example of what a knight should be when compared to the likes of DeWayze and DeWett. So do I risk trusting a good man in a bad place or use a bad man to make good on my vengeance.
So my answer to the question is: I'm ploughed if I know. I did support the order in the swamp during the force recon, but I thought that I was stopping a weapons shipment by Hav'caaren, and thus helping to stop an escalation of the violence.