I disagree, and I think you're just kind of lowkey trying to insult her character so I'm just gonna stop here.
Er, why? I have no issues with blood magic, so I think this'd be something I'd agree with Vivienne on.
I'm trying to dial back a bit on my negative opinion of her because it seems like interesting possibilities are still available, especially if she contrasts in some ways still with the more devout Andrastians.
Of course she would, It goes against the system that is her bread and butter, even if she does have no issue with it personally (which i strongly doubt) she wouldn't support it likely because if it comes to light she is around blood mages, it negatively effects her own position.
It went all right for Grey Wardens. I doubt it'll do too much damage here.