Rather than address these points line-by-line, there is a bigger issue at play: a difference in understanding (or opinion?) over what the Overton window is. This is particularly evident in that you cite Europe as 9.3% of the world as relevant to defining it.
The Overton window mainly classifies the kind of ideas that are "politically acceptable" on the stage for which it's defined, using terms ranging from "unthinkable" to "radical" to "popular" to "policy". On the world stage, I would argue that the most left-leaning of European countries define the left end of the window (given that they have enacted left policies), and the most right-leaning countries (e.g. Singapore) define the right end of the window. It's not a matter of proportion.
That said, I agree that the global window is rapidly shifting right, as in your example of France.
Okay, point-by-point:
> Military
I agree that the military does not neatly fit into a spectrum which applies well on the global window of left/right. Reaching instead for political philosophy rather than political practice, I think it's better to introduce the 2-dimensional political compass to understand this rather than relying on the 1-dimensional left/right spectrum: war is more favored by authoritarian politics (which is to say politics that value authority, rather than necessarily repressive regimes, which are totalitarian). I would also say that authoritarianism tends to be more popular on the right, though the Soviet Union offers a clear counter-example. This issue is messy indeed. But, generally speaking, I think that American leftists (as a distinct group from liberals or Democrats) are not in favor of war, whereas everyone right of and including Democrats are generally pro-military and weakly or strongly in favor of American imperialism.
> Social justice
"Social justice" is ill-defined here, and I don't really think Democrats push for it. A positive "social justice", as I understand it, might, for instance, consider reparations, which I don't think any contemporary Democrats have pushed for. Democrats adopt a more equality-oriented (not equity-oriented, which I would argue is more aligned with what "social justice" calls for) approach to social issues, outside of certain matters like ostensible support for affirmative action.
But, I don't think this is the thread to define and argue over whatever "social justice" means. You can send me an email if you want to clear that up.