Anarax
Master Black Belt
Just to be clear, I'm a huge fan of the Star Wars universe, but I'm a bigger fan of good movies that have solid writing and production.
I'm not saying the prequels are perfect, just that the Star Wars fanbase is rarely happy.
I don't know if that's canon or not
It is canon, Star Wars Rebels was post Disney buyout, though the fuel concept was already in place pre-buyout as well.
Sure. I get it. But Poe isn't the one in authority. Benedict Arnold was acting as his conscious dictated. And is anyone surprised that when he was found out, he was hung? People don't mutiny or commit treason because they think they have a choice. And, really, no, he didn't have any right to question her. In a military organization, she owed him no explanation. Blame the writers. They wrote him into a situation where there is no reasonable alternative to getting rid of him. In any society I know of, that would have been grounds for execution, but I can see maybe exiling him.
The Rebellion/Resistance isn't exactly military, thus all military policies and procedures wouldn't apply. If no one acted on their conscious in the Star Wars universe, the Rebellion wouldn't exist. Your interpretation of the Poe/Holdo storyline and who acted inappropriately will be heavily influenced by your ideology(authoritarian, libertarian, etc). However; when you look at the history(books, comics, wookiepedia) of the rebellion, Poe embodied many of the characteristics of the rebellion by rebelling against an authority figure to protect everyone else.