Here's the spellings for those names.
Tarabon = Taravangian (the King of Kharbranth, right?)
Sadious = Sadeas
I'm not sure who you're referring to with Alocar...you wouldn't mean Elhokar would you? Dalinar's nephew?
The reason I hate Taravangian is that he was a
nice guy for the majority of the book. That particular reveal was like.
Szeth I'm not so sure about. I get the feeling the oathstone has some kind of magic around it that even if it doesn't directly compel Szeth to follow orders, gives him the psychological compulsion to meet out the terms of his punishment. I don't think we know enough about his situation to make any real condemnations just yet.
Sadeas totally needs to die, but how to do it without breaking the country? Hmmm...
Gaz may already be dead, we don't know.