@ambiguous_yelp But if an essential foundation stone of your argument is that nonhumans can be people, wouldn't it be helpful to cajole an admission that the closest living cousin species to humanity could possibly qualify, and then proceed inductively to further branches on the tree of life until a line is discovered?
I think that name the trait is a better symmetry breaker against speceisism.
What trait does an abandoned baby human possess that a chicken does not that makes it ok to kill and eat the chicken but not the human?