Liechtenstein is probably the closest second in direct democracy nature in Europe and I'd argue the outcome was close, maybe even better. They do also have some quasi-monarchist elements too though -- they have a monarch but also right of secession (unique in europe I think) to check the monarch so they have basically a direct democracy clamp on any monarchist tyranny on direct democracy outputs.
I think the results have been pretty consistent that out of places 90+% euro-white voters in direct democracy and relatively neutral in WWII performed well (Lichtenstein was neutral in WWII too). I think it's harder to find examples of the creation and effectiveness of direct democracy in places where there is a lot more variance in culture -- Uruguay might be one good example but they are also probably the most guarded of citizenship in all of South America (you can very easily get residency but the judges will produce endless BS requirements if you try to become a citizen; they basically will not let it happen).
>But it's not the consequence of the skin color or the neutrality
Lets not pretend we're referring to the actual melanin in skin jumping out and doing something. No one thinks an albino kid of black parents is suddenly going to think like a Swiss voter.
>All European countries have been practically 100% white until not long ago with vastly different outcomes.
The outcomes of WWII ~neutral nearly all euro white fairly direct democracies (that's basically, switzerland and Lichtenstein) have actually been highly correlated with some of the best outcomes in the world, so I'm not sure how on earth you came to this conclusion or straw man argument that merely having white skin is magically gonna get you anywhere.