It seems weird Buddhism is such a minor religion in Europe while it is so rational, based on individual experience (rather than belief) gained through reproducible applied self-regulation techniques, backed by neuroscience and explained with consistent philosophical logic.
What you're saying is sort of like reducing Christianity to "love thy neighbor" and wondering why that didn't catch on wherever people are nice.
I'm in a Buddhist country right now, and I really dig it, and I'm learning all kinds of awesome things about how people live -- but I'm not sure I'd say the locals are more rational than the Europeans. Nor would I say the Europeans are necessarily more rational than anybody else... maybe "performative rationalism" would be a good term?