Estonia was deemed to be an Authoritarian habitancy, meaning a significant prevalence of non-sanguine types.
In simple terms, the researchers unwittingly could have stratified the subjects into primarily non-sanguine A + PA types on one hand and primarily N + NP types into another. So, here the difference between the thugs and the nice guys, thought to be only a difference in aggression, creates a difference in sanguinity (the N trait) because of the reciprocal entanglement of traits N and A.
So, very possibly their TT genotype is related not to aggression but to sanguinity, either causatively or because of the stratification of NPA types in their study.
Actually, the countries where there is a high prevalence of non-sanguine types are ideal research grounds, but if studies are done with disregard to the basic NPA types, the entanglement of traits N and A is bound to cause confusion. (See our monograph: Genetic entanglement of the personality traits of sanguinity and aggression in case-control studies.).
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