Moral standards and manners differed from country to country people to people, and there's no real 'universal' accaptance of what is listed as civilized, but what is clear is that civilized people are developed enough which characterized their advance taste, manner, and overall well organized.
Stealing is uncivilized if done by personal means, but stealing on a grand scale clearly is civilized. In fact modern economy is based on stealing. The interests based economy is in fact a mass state sanctioned and organzied stealing from the poor by the rich.
So does killing and invading, if done on a personal level, its uncivilized, but move the scale into nation sized attempt, that's totally normal. Because everyone is doing it.
If killing and invading someone else equals to uncivilized, then the Roman Empire, The Arab and Turkish Caliphate, The British empire, The Americans etc, none of those would be considered 'civilized'.
Yes just one.
Yes you can, the Brits are polite and well mannered as well, in fact the 19th century portrayal of a British Gentlemen is summarized as this
Doesn't stop them from tying humans in front of a cannon and torn their bodies in the process.
Not to metion stealing people's land
And this is at the peak of Britain's and European 'enlightment'
look at the example above. I've never heard Britain called as uncivilized, why should Russia be called uncivilized now for practicing realpolitik on the battlefield ?
Nazi Germany while having comitted crime, their crime is not that extraordinary to begin with. Yeah I know they unjustly killed some people, but so does everyone else including members of the allies.
The very reasons why the Nazi crimes are magnified is because their victim is now powerful enough to control the narratives, I don't see what so strange with Nazi brutality compared to maybe Belgian brutality in Africa, France's brutality in Mali against blacks.
In fact Nazi's are pretty much civilized. as does every other country, they dress, they know hygiene, etiquette etc.
In fact I see some hidden racism when it comes to the portrayal of Russians an 'mongols', because Europeans looked down at those people as uncivilized, without proof that they're any better