The ability to protest peacefully and to voice unpopular opinions without being arrested and imprisoned arbitrarily are cornerstones of the U.S. Constitution, and are the reasons why, in spite of the many limitations imposed upon sectors of its society over the centuries, the dominant order has been forced to change to allow people of color, women, and others to take their place in society.
Animals raised for their flesh or body products, however, remain without even the most basic natural rights: to move around, to associate with their conspecifics, to breathe clean air, and to nest or wallow or graze. They have no choice but to rely, as do all non-human animals, on human beings to speak up for them and articulate those basic rights, as well as to challenge those who are either indifferent to, or actively complicit in harming, their welfare.