This contrast helps to:
* Emphasize Poitier's distinctive style: By mentioning the common villain trope, it suggests Poitier didn't fit the typical villain mold.
* Convey a message about Poitier's character: The contrast implies that Poitier's characters were often portrayed as morally upright and well-presented, which is consistent with his roles in many of his films.
* Create a humorous effect: The juxtaposition of the two sentences can be humorous, especially for someone familiar with the "villain needs a shave" trope.
Overall, the second sentence adds an element of humor and irony while highlighting a significant aspect of Sidney Poitier's screen persona.