According to "Memory Alpha" V'Las was the child of Romulan sleepers - and therefore not Vulcan. We're to assume that Vulcans have in some way genetically adapted to logical life due to the existence of pon farr which I would suggest is something Romulans don't experience despite being a subspecies/same-species as Vulcans. They should have had someone on Enterprise point out to T'pol that arrogance, disgust, contempt, spite, and egotism are all emotional if they were really aiming for this "Vulcans are not especially adapted to stoicism" line. It just makes the humans look dumber than humans are.
Reading Memory Alpha/Beta and even the novels. There is nothing genetic about logic, its a philosophy they incorporate into their behaviour, e.g they have to meditate to control their emotions. Hence the V'Tosh Katur Vulcans are looked down for not following the 'established religion'. Its the sc-fi version of Catholic Europe in the Middle Ages before the Reformation. Back then anyone not toeing the line in society was punished. I am surprised no one pointed out to the Vulcans that their strict adherence to Surakian beliefs was a religion. In my head canon, Vulcans are natural extremists, they cannot behave moderately, strip away the logic and they are nothing more than intelligent savages.
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