The USA requires healthy children many vaccines to enter most public schools in the country: MMR, polio, chicken pox, and DTaP are the ones most common. Polio is still endemic in a couple parts of the world. Most public universities require the meningococcal vaccine. Why? These are all potentially fatal, often damaging, and communicable viral originated diseases! Requiring people to enter certain facilities with a vaccine certification is an incredibly marginal (literally N+1) extension on top of what a vast, overwhelming, near unanimous number of American adults have experienced directly in public school or for much older Americans, indirectly through kids of their own. Decrying this specific idea as some sort of unprecedented and irreversible expansion of the security state of the USA is laughable. I guess you would have a leg to stand on if you were Amish or something, but you likely would not be on an online forum complaining about it.
Over a quarter of Americans have already been vaccinated against a disease that did not knowingly exist 16 months ago, and that is thanks to the overwhelming power of the American government and economy being directed in a way to benefit the American people and global community at a miraculous pace. For decades you could say "this country put man on the moon" as a way to define the power of American ingenuity and willpower. Now we have this. At this point, citizens of the US should rightly see any failure of a government-oriented project firmly as a political choice. This country absolutely can craft an effective covid vaccine passport program.