[flagged]
What happened in Scandinavia was not that Scandinavians were all that much more socialist than the rest of Europe, but that the workers movements happened to be more successful to the point of obtaining a political hegemony in the post-war years that allowed them to shape the system to a much greater degree, and the conflict level was much lower.
A large part of this was in response to religion. In particularly the role of strong Lutheran state churches that looked down on ostentantious displays of wealth and promoted community and sharing, which made it easier for the Christian parts of the right to find together with the labour movement on welfare issues. As a result the first comprehensive welfare bill in Norway, as in many European countries, was pushed through with the votes of the Christian Democrats.
In Norway at least a lot of this "love of socialism" is much less a "love of socialism" than it is a mix of that tradition of community and a strong but relatively moderate labour movement.
But it is also pretty recent - up until the 60's for example, Norwegian prisons were very harsh and following very much an idea of dealing with "tough love" for sinners that needed to be purged. Social and criminal reforms didn't really start happening at pace until the 60's and 70's, and were a constant issue of tension with religious values.
I think it's more that you've touched on a similar foundation: In Norway at least I think you'll find that quiet nature very much matches what used to be seen as how a good Christian would behave. Too much excitement would not do.
[you probably got flagged because HN is very sensitive to dragging politics into subjects that aren't inherently political]