If you copy then it is not self-expression.

Why do people talk of the horrors of old age? It's great. I feel like a fine old car with the parts gradually wearing out, but I'm not complaining,... Those who find growing old terrible are people who haven't done what they wanted with their lives.

Just as we reject racism, sexism, ageism, and heterosexism, we reject speciesism. The species of a sentient being is no more reason to deny the protection of this basic right than race, sex, age, or sexual orientation is a reason to deny membership in the human moral community to other humans.