 That view is contradicted by Sylvia Wynter, who argued that Las Casas's 1516 Memorial was the direct cause of Charles V granting permission in 1518 to transport the first 4,000 African slaves to Jamaica.Revisionist histories of the late 20th century have argued for a more nuanced image of Las Casas, suggesting that he was neither a saint nor a fanatic but a person with exceptional willpower and a sense of justice, which sometimes led him into arrogance, stubbornness, and hypocrisy.Some historians, such as Castro, argue that he was more of a politician than a humanitarian and that his liberation policies were always combined with schemes to make colonial extraction of resources from the natives more efficient.