The democratic countries follow the pattern of status quo powers. Is that because they are democratic or because they are status quo, or some of both?
The rules are of the status quo powers (matching their political cultures), by the status quo powers, for the status quo powers. Of course they follow those rules and support them. The rules seem to require a country to be a democracy to be legitimate - I agree with that as necessary to legitimacy (not sufficient), but obviously that doesn't suit non-democratic countries.
And like status quo powers, when they break the rules - most prominently the US many times, such as the Iraq war; the EU treatment of refugees and undocumented immigrants; and currently by Israel with US sponsorship - then they let themselves off the hook. They engineer technicalities, such as the weak UN resolution arguably authorizing the Iraq invasion; or just look the other way. They say they can't be handcuffed etc. (And some of those actions may be the right choice - I'm not judging - but they certainly violate the rules.)