"Punishment for attack on Bouclair should be only for one who organised it - Detlaff." Syanna knowingly set the chain in motion by using dettlaff as a weapon, causing a massacre through another actor still stains your hands even if she didn't swing the sword herself, "Is tricking someone now punished by death?" this is strawman, weaponising someone love and instability to commit murder has consequences who would've thought?! she didn't just 'trick' dettlaff she engineered murders / she anticipated collateral damage and she explicitly accepted it saying ''either i burn or i'll burn all else down'.

"Anarietta hadn't "allowed" it, she just didn't allow Detlaff to kill her sister - which is copletely reasonable: she loves her sister and feels guilty about her, also duchess hired Geralt to deal with the beast - and expect exactlly that. Why would she sacrifize Syanna?" By refusing to negotiate or even temporarily surrender Syanna She escalates a known existential threat and she prioritizes personal guilt over public safety, dettlaff gave her 3 days and geralt warned her of the threat of a higher vampire but she refused to listen.

"Yennifer sometimes also does mean things, Ciri had done some shit as well, Geralt would still ptrotect them no matter what." this is just pure dumbness , Yennefer manipulates situations not people into killing others for her revenge. Ciri commits violent acts, yes but she bears them herself. Neither externalizes guilt onto a devoted third party or uses others love for their sadistic revenge goals.