Gary L. Francione said this quote
“ The rights paradigm, which, as I interpret it, morally requires the abolition of animal exploitation and requires veganism as a matter of fundamental justice, is radically different from the welfarist paradigm, which, in theory focuses on reducing suffering, and, in reality, focuses on tidying up animal exploitation at its economically inefficient edges. In science, those who subscribe to one paradigm are often unable to understand and engage those who subscribe to another paradigm precisely because the theoretical language that they use is not compatible.I think that the situation is similar in the context of the debate between animal rights and animal welfare. And that is why welfarists simply cannot understand or accept the slavery analogy. ”