That link isn't even about aggressive behaviour, it's about decision making and cognitive processes. "Risky decision making" refers to making a decision under circumstances where the outcome is uncertain. Nowhere in either abstract do I see where this study is about aggression.
EDIT: "Risky behaviour" in your sources, and in the world of psychology means something quite a lot more specific than you yourself have meant it, so your use of psychological sources appears to me to be irrelevant.
EDIT:
Quote:
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One may ask why an allele that seems to have undergone strong positive selection in human populations nevertheless is now disproportionately represented in individuals diagnosed with ADHD. The common variant/common disorder hypothesis (16) proposes that common genetic variation is related to common disease either because the disease is a product of a new environment (such that genotypes associated with the disorder were not eliminated in the past) or the disorder has small effects on fitness (because it is late onset).
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Your source isn't about regional "novelty seeking" behaviour either, it's about the connection between "novelty seeking" behaviour and ADHD. What were these sources supposed to illustrate again?