I would say the opposite, that 'failure to obey' is insignificant; see my post 33.
I have to ask – there seems to be more to this story than is being told in the thread. 1) Did the man in any way point the weapon (shotgun) at any cop or bystander? 2) Did the man in any way endanger anyone? [...] what was the decision to shoot to kill (could not have been any other intention) based on? [...] 3) DID HE THREATEN ANYBODY?
Those are good questions, and as the article did not say otherwise I assume the answers to be: 1) No. 2) No. 3) No.
Why?
Because a story like this would be much more sensational if any of those were 'yes,' given the political/media stance on returning veterans.
You are correct - the FAILURE to “OBEY” is the thing.