As a non-Dutchie living in The Netherlands, I don't think the Dutch are inherently are better than Bulgarians.
I'd bet good money that if there was another EU country with a similar social safety net where the median salary was €200k (with correspondingly generous welfare) that a certain segment of the Dutch population would be flocking to it to defraud that government.
I don't understand why it's controversial to point out those basic realities among countries in the EEA. Nobody's claiming that there's a unique genetic link between Bulgarians and fraud, just that the economic incentives involved are all going one way.
1. https://en.wikipedia.org/wiki/List_of_European_countries_by_...
"People should not even think in these terms." Thanks for telling us all how we are allowed to think.