The reffing in that game was pretty terrible. Both teams at times had the right to be upset.
That aside, the US was the better team in the game and they carried most of the 5-on-5 play. The epic collapse at the end was not ideal and is the type of lapse that can cause your tournament to be over. Adversity wise it's great that it didn't seem to phase them and they were able to end up winning, but hopefully, a lesson was learned in the process. Yes, it was a lucky goal for Carlsson on a bar-down tip by Tuch into his own net that he couldn't replicate again if you gave him 100 tries. But also don't play with fire when you don't need to and you're easily controlling the game.
The preliminary round went as well as you could have hoped and they closed it off to get the most advantageous QF crossover opponent possible. This team is capable of beating anyone here and being a tough out even if they don't but we don't often optimize our chances here by taking the easiest road possible (on paper), either, so it was great to see them pull it off.
Onward!