I just watched that season, and she was extremely upset about. It's 100% of the reason she has her fucking meltdown, leaves Republic City, gets attacked by an evil spirit and her cousins, ends up on the island, and has to reconnect with Raava. Besides, Iroh was on board with going after the Northern Water Tribe and Raiko, while his isolationism is more than understandable, was being stupid about it to some extent. Shit was happening on his own turf because of the Civil War, and he wasn't doing much to stop that. Lin wasn't helping either. Mako straight called Korra out on how stupid she was being. It's why they broke up.
As far as Asami and Bolin, neither of them were in any danger. Varrick just wants Mako off his back, but he was never going to do anything to that degree. When Mako wouldn't bail, he got him framed. Plus Asami figured it was going to help the Southern Water Tribe, which she was on board for. She had two reasons for entering that contract. Bolin was helping get Varrick to the point he wanted, by being the star of Varrick's war propaganda. When Raiko wouldn't listen, Varrick tried to have him kidnapped, although I'm not sure if he intended for Bolin to step in or not. That part, I was actually confused on. I knew the purpose (to get Raiko to jump in on that war action), but I wasn't really getting the actual play.