If you're a HN which is no guarentee. Plus, from what the conversation when you try to claim blood rights indicates, it has to be announced and done with a bit more legality than 'I see you, you die' which is what it was. Imprisoning a GW is not, in fact, treason. Why would it be? You can consider wearing red to be high treason and it doesn't make it so. You can feel free to consider it morally repugnant and crossing all sorts of lines but treason is about legality not morality. Imprisoning a noble would get him in trouble, yes, but just because he breaks the law every time he turns around doesn't make your actions legal. As such, arresting you is also legal. It might be a horrible idea for you and you can't afford to let it happen but that doesn't make it legal and so I don't see that Cauthrien DESERVES to die for what she does. Maybe she needs to anyway because you don't have much of an option, but it doesn't make Cauthrien stupid or deserving of death.
I always play HN and thus everything I say is based on this very view. Then again, I would always kill her as being imprisoned is not an option. I mean, we all know that you will be given a chance to break out of the prison, but the Warden does not. Imagine the war with the warden being imprisoned.
First of all, the Warden is (if a HN) a noble. Secondly, your allusion is not only non-fitting but downright wrong. You compare ethics to attitude. Howe is obviously attacking the order the Warden is part of thus offends his fellow brothers, giving him the right to strike back. And yes, killing someone who is well-known for being a vicious murderer, torturer and traitor is a good deed - it actually is the BEST one can do if he consider himself being good as you kill one person to help countless others. Would you also consider someone being wrong or "evil" if he decided to kill a dictator? I certainly wouldn't.
Cauthrien is not stupid, no, as I already said, she just does her job. Wrong place, wrong time, that's all. And I really doubt that she'd be allowed to imprison the Warden, a noble, without any sort of decree or any kind of reasonable backup. She just steps in the room and wants to arrest him, then attacks him
first and
dies as a consequence.
Wrong place, wrong time, too focussed on her duty instead of common sense, that's what really killed her.