You original argument wasn’t about what’s good for “Democracy”, it was about what’s good for “Mankind” - they’re quite different things: as I pointed out, Democracy somewhere, even if perfect, isn’t good for people elsewhere (because it doesn’t represent them at all), and that’s without going into the whole point of “Is a Democracy which is deeply subverted (like in the US at the moment) actually a good thing even for the locals?” or maybe “How subverted must a Democracy be before it turns into a bad thing even for locals?”.

I think your NATO point is indirectly largelly about America because most of the military power in NATO is that of the US and if NATO collapsed without an American power collapse (or just America turning isolationist), America would still be a major military power in its own right, and the EU (which does have a mutual defense part in its treaties, but which not really used ATM because NATO exists and works) would be as well (and a NATO collapse would force strengthening EU internal military cooperation, something which people like Macron have already been pushing for) and they would be facing the likes of Russia and China with parity and would likely align as two big blocks when need just like China aligns with Russia because of convenience, not mutual love.

The other alternative NATO collapse scenario, what I call the nasty scenario, would be a total collapse of whatever is left of Democracy in America (in turn leading to a collapse of NATO) or at least extreme isolationism, which would leave EU vs China (+Russia as its poodle) and America in “splenderous” isolationism or worse. However in that scenario my point still stands that for all the unalligned nations in the World it wouldn’t really matter if dominance was of “Democratic” nations or “Authoritarian” ones because neither regime represents foreigners.

I do however agree that the secret for stability for Mankind is a multipolar world, not because one side is “Democratic” but because when there are more than one dominant side, attacks against unalligned little guys by one of the sides tend to pull in support from other sides of the multi-pollar world, making them far more risky than they would be in a World with a single dominant power.