The blogger proposes a theory that actually strikes me as being somewhat plausible:
Researchers suggest that these folks are able to rise to the top of companies without being found out because of the chaotic nature of modern corporate structures - especially rapid position-hopping - which makes their behavior almost invisible. They are not in one job long enough for co-workers and superiors to see their problems. In addition, their charm, charisma, and extroverted behavior not only appears normal but ideally suited for today’s global, competitive world.
Boddy also notes that in modern companies it’s relatively easier than in past years to claim success for a project even if you had little to do with it because of all the movement and team participation. “Success could thus be claimed by those with the loudest voice, the most influence and the best political skills. Corporate psychopaths have these skills in abundance and use them with ruthless and calculated efficiency,” he writes.