I feel bad for the family. They didn't act disloyal. Also for the sister to kill her own sister. God that must be so hard. How do you live with that? I mean she was the baby sister. Imagine having a little baby sister that you loved and cared for, watched her take her first steps and everything and then having to do that? God that would destroy me inside. I feel so bad for her. Yet what had to be done had to be done. I just wish it was a trial or maybe Aubrey should have gone to prison.
Tbh, I feel for her family too, especially her mother.
Just my opinion though;
If they went for a trial, it could've been probably worse and might even lead to the execution of them all as what Riftan have said. Since the incident not only involved the kidnapping of the Grand Duchess but the lives of some civilians, and soldiers who were found dead and were killed because of the info Aubrey provided for the 'terrorists' just to satisfy her love or ego lol
At the very least, she wasn't tortured and died a slow painful death.
Personally, I admire his assertiveness.
He might be a generous and kind leader but he knows how to impose punishments to those who deserve it.
Instead of being someone who either says things like, "I'll forgive you if she managed to come back safe and sound." or "I will let you live but- yada yada." and cliche things similar to that. It is kinda refreshing honestly.