The main "antagonist" did nothing wrong.
And I think that's the beauty of the witcher: everything is shit, everyone is shit and you just happen to be on one side of the fence, forcefully drawn into the mess, which is why the "right" side is neutral in theory / canon. I mean, quite fankly, Azar Javed was right at his little speech at the end of chapter 3. Salamandra was in no way any worse than scoia'tel or the order, or even foltest. And Beregar did nothing wrong, he just suffered because the witchers decided his life for him and took what he wanted from him.
Which is why idealogues, but not zealots, such as Siegfried really shine because they are one of the few truly virtuous people on any side, as opposed to bioware games where an entire race or faction is virtuous and the other race or faction is just made of assholes. That said, only faggots sided with scoia'tel.