Because people are just items to use on the way to whatever your progressive goal is.
Via Daily Caller:
Chimpanzees should be freed from zoos for the same reason that African Americans were freed from slavery, a group of progressive legal entrepreneurs working to level the courtroom rights of humans and animals claimed in a recent lawsuit.
The offensive comparison is a dangerous and self-serving effort by progressives to win legal rights for animals via courtroom decisions, said a fellow at the Discovery Institute in Seattle, Wash., Wesley J. Smith, an author and a critic of the claim that legal rights should be shared with animals.
The claim also makes a mockery of slavery’s real impact on people, Smith said.
“Can you image what Nat Turner would said if the treatment he got was treated as equivalent to the treatment of a chimpanzee?” he asked.