Well, since it proposes to amend the U.S. Constitution, which is addressed to public servants, it is the public servants who will be affected who are objecting. If they have to treat every natural person with respect, there won’t be anybody to lord it over.
Legislative bodies are being asked to eviscerate themselves and their cohorts. It hardly seems fair.
Consent is the basis of the Constitution. That is incomprehensible to non-sentient individuals–i.e. the instinct-driven.