It's also just not the general lesson from history either. Plus you have to recall that in many cases war is about resource acquisition as much as anything else, and sometimes wars are popularized as ideological crusades when they are masquerading as resource disputes in order to motivate a populace.
Something that has become apparent to me is that in our years of somewhat peaceful economic growth, we seem to have forgotten that there are haves and have-nots and that the economic system that was created to hopefully replace war with peaceful competition only works so much as the large powers decide that it works well enough. Those who are have-nots tend to not have the proportional military leverage to do something about their position.
Our rejection of colonialism, mercantilism, and imperialism in favor of a "rules based international order" has blinded us a bit through abstraction and legalese to the reality of how the world works and the limits of resource availability given the size of the planet and the population numbers.
> As such it should be the priority of all democracies to extinguish authoritarians whenever possible.
I used to think this as well, but I recently re-read George Washington's 1796 Farewell Address [1] and it aided me in coming to the conclusion that such a moral crusade is neither wise, nor moral, and least of all practical.
There will always be some nations that have governments, authoritarian in our eyes or otherwise, that we disagree with from a political perspective. But we simply do not have the time, resources, or motivation to do something about all of them, and even as we try to do something about one or more of them we wind up with others popping up. Instead we should seek to treat fairly where possible, and treat not at all where necessary due to immoral behavior and stop trying to control the entire world. That doesn't mean we should never intervene or do anything, as in the case of Nazi Germany or perhaps other atrocities, but a national policy of extinguishing authoritarians seems to me to be one that isn't in our best interest.
[1] https://www.georgewashington.org/farewell-address.jsp