His hit on Joe Corvo was potentially dangerous. But that's because it was poorly delivered. It was such an awkward check at an awkward angle in an awkward situation.
It wasn't an intentional targeting of the head. His skates left the ice but he hardly launched himself at Corvo. And he hit Corvo with his shoulder, not an elbow.
It wasn't reckless either. Reckless means that somebody is hitting other players carelessly. Whereas Turris seemed to hit Corvo clumsily.
The NHL considers past history when making these rulings. Turris' history shows that he's not normally a hitter at all. He's 19th on the Senators with 16 hits this season. That's 3 more than Zach Hamill, 5 fewer than Tyler Seguin, and 10 fewer than Jordan Caron.
I understand Jack Edwards' frustration in the moment, but the NHL was correct in not suspending Kyle Turris.