I have to say I am not a fan of gifting a GC to another rider - even one who seems as sympathetic as Kuss. I can respect the sentiment and the person(s) doing it, but I do not agree with it.
That being said, I really don't understand the conspiracy theorizing, because everything people have said, is perfectly consistent with their personalities and prior actions.
Roglic is a competitor. He rides to win (as he should), and he wanted this race to be decided on the road, by who is the strongest. This is very consistent with how he has ridden throughout his career. It's consistent with what he has said throughout. It doesn't make him a bad person and it doesn't mean that he isn't happy for Sepp Kuss.
Vingegaard is very much a "sensitive" guy from a small village in Scandinavia. I don't see a reason to disbelieve him when he says he wanted Kuss to win once it became clear that was a realistic option, and I don't see any reason to doubt his recounting of events. It's not something any of the others who know what was said and done contradict, and it tracks with how he behaves as a person both in and outside races.
I think JV has failed somewhat in team management, but I can understand why this was a very, very difficult situation for them to handle. Because they have two "Kings" on the team - Roglic, who is the "old King", is a fantastic rider with a great palmares. And Vingegaard, who is the "new King" and who (IMO) is the undisputed GT rider at the moment - and each with their own wishes as to how to handle the situation.
I found it quite interesting prior to the Vuelta, that the JV DS explicitly went out to say that Roglic was still "King of JV". Because I think it pretty clear that is no longer the case - although Vingegaard will not win the Vuelta, the team is basically doing what he (says) he wanted apparently against the wishes of Roglic. I don't see it as impossible for Roglic to continue at JV (because I don't think Vingegaard actually minds sharing captaincy) - but the question is whether he can accept no longer being the absolute top dog.