Could this culture with its high levels of education and standards of living causing these people to have a much higher and false sense of abilities that don't exist?
OK, I still take the bait and try to elaborate this. First of all, the widely publicised Finnish diving fatalities relate to one more or less organized group of divers, about a dozen or so, who are pushing the limits with extreme dives. This kind of group can form in any country or culture, and I just don't see any relevance trying to relate this to nationality or culture.
Otherwise there is no common nominator in Finnish diving fatalities.
Regarding your ideas about educational system and living standards, compared to neighboring countries, both are actually much lower. Average Swedes, Norwegians and Danes have significantly more disposable income and higher education than Finns. Also the USA has much higher percentage of population educated at college level or above (and this educated part of population does have more disposable income). Anyway, this doesn't relate to diving any more than having a slightly less divers around as diving is not the least expensive past-time activity around.