Many countries?
Just a handful of African countries. Not anywhere with a significant tourist industry.
Yes many countries. Austrialia, Bahamas, Bangladesh, Colombia, Egypt, France, India, Indonesia, Mexico, Pakistan, Saudi Arabia, and Thailand (to name a few). That's 6/7 continents covered and several on that list have significant tourism industries.
It really is.
Again, using the yellow fever vaccine as an example, the vaccine currently used was developed in the 1930s and attempts at controlling its spread between countries have been ongoing since the 1910s. It's not a new concept.
Because most people on Mumsnet are not holidaying in fucking Eastern Africa, that’s why. Maybe it’s a point of conversation there, who knows?
Way to miss the point. Either vaccine passports/certificates are an "injustice" or they are not. You can't say it's OK to restrict the movement of people from Brasilia or Accra due to a virus risk, but it's not OK to restrict the travel of people from Brighton or Aberdeen due to a virus risk. Especially when the one you're arguing you shouldn't need a passport for is the more problematic of the two.
This wasn’t happening unless you were applying for a residence visa.
Nope, all those countries I've listed at the start require people from, or who have spent time in (more than 12 hours I think), at risk areas to have a vaccine certificate before they can travel to/through. Nothing to do with residence.