On the other hand, others argue that horse-tripping is not a traditional part of Mexican culture. Individuals within the Mexican-American community such as Cesar Chavez have come out in opposition to inhumane treatment of animals being justified on cultural grounds. Chavez, who became a vegetarian and had concerns for the welfare of animals in general, had written a letter in 1990 to Action for Animals stating his view that legislation was needed to ensure the humane treatment of animals at rodeos and explaining that violence was linked with racism, economic deprivation, and various animal sports, including dog fighting, cockfighting, bullfighting, and rodeo. This letter did not specifically mention charreada, though Chavez drew particular attention to rodeos where no veterinarian was required to be present.