Vaccines have two purposes - to protect the individual vaccinated, and protect others in the community from infection.
If individuals decide they do not want or need the protection afforded by a vaccine, their views sould be respected although I think them foolish.
Personal circumstance makes a difference to the risk assessment - age 20 the probability of serious outcomes from infection are low, if 70 with other health issues the risks are much, much greater.
The impact on the community is another issue. The reproduction rate for measles is estimated at 12-18. This means that a very high level of immunisation (~95%)is required to stop measles spreading amongst those who are not vaccinated.
Covid has a "natural" reproduction rate in the UK of ~3 (each person infects 3 others). On average this means that if 66.7% of people are vaccinated the effective R = 1.
But not all environments are the same - contrast a builder working mostly outdoors with a nurse or an estate agent both of whom work mostly inside and mix extensively with others.
So it is entirely reasonable that vaccination certificates are required for some jobs - no vaccination = no job!
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