Cops are not pigs, they are authoritarian thugs. Pigs are intelligent, sensitive animals. When we use language which denigrates non-human species to describe human behavior which is oppressive, we become oppressors of animals. The oppression of animals by humans is called speciesism, and has the same roots as sexism, racism, homophobia, and classism to name a few. The only way to really transform this sick system which oppresses us all is to honestly look at how we as individuals oppress others of our own and other species.