What's the argument here? Spaghetti and meatballs aren't explicitly guaranteed, either, but you can eat them without signing away any other rights.
(Not addressing GPs argument, just that the spaghetti & meatballs one doesn't hold water.)
Having Humanist-Centric politics makes the world a better place. Humans with shitty governments, parenting and environments which are shitty typically wind up being shitty humans.
Building walls, guns, bombs, cages, cops, totalitarian and authoritarian regimes are no substitute for actually working to be better humans