Let's assume Poe was indeed an officer before getting demoted. That still doesn't invalidate the first point. Some unknown is giving away their position to the enemy, so the head being cagey about their next move is still a justifiable step, even if it has the potential to cause greater trouble down the line.
Which again, I think it was the opposite - Finn and Rose's errand was a big deal, and that ending scene was meant to support that.
The movies did a poor job of showing that. Even after TFA, everyone was immediately coming up with theories about Rey's bloodline to explain her strength, instead of her just... being strong, without needing some kind of super-special pedigree, because we too had been conditioned to see the Force as hereditary by Lucas.
For starters, this is beyond melodramatic; they've hardly "thrown out everything." Many aspects of the Force remain unchanged.
But even if your statement were accurate, well - if that's the mental jump you need to rationalize what they've done, then fine, feel free to tell yourself that. The reality though is that it's their setting, not yours, and they can change it however they feel they need to, in both subtle and drastic ways. If you really see the changes as large enough to make this not be Star Wars anymore, your only remaining choice is to vote with your wallet, or not.
I cannot fathom how your second sentence follows from the first (which I agree with.)