I'm always wary of anything that ties behavior, or behavior propensities to genetics. We're just at the beginning of understanding genetics, sort of like where Louis Pasteur was at the time he finished medical school, in understanding disease.
Can't stick your head in the sand because you don't like it; though. People are very uncomfortable with the idea that any of their personality is genetic, but it's clear that it plays a role.
A lot of pain was caused for a lot of families over the years by people insisting their kids were Schizophrenic because they weren't raised right or were traumatized or something; turned out Schizophrenia was a medical condition that was largely genetic.