There are many problems with misrepresentation of minorities in film and TV. The reason behind this lack of diversity is basically that the majority of entertainment executive and studio’s CEO are overwhelmingly white and male. It is a very competitive field and most of the decision makers are overwhelmingly white male seeking the best profit in film. The bottom line is that movies are costly to produce and Hollywood is big business. It is highly motivated by consumerism and the marketing dollar, and the result of the limited analytics and demographics about television media.
The lack of minority writers is also a factor. For the past 20 years the writer rooms have been staffed mainly with overwhelmingly white writers and if a Latino role gets written in at all it is portrayed as the stereotypical over sexualized Latina and the Latin macho.