Participant,
Those who are making the vaccine mandates feel that they have given people enough time to get vaccinated on their own volition.
For the sake of public health, those making the mandates are convinced that the benefits of every individual being vaccinated demands that every individual join in this effort. This will hopefully reduce to close to zero the amount of people dying and getting sick from covid.
The medical community has done its job of education regarding the vaccines.
There was hype about “the” vaccine – all 5 of them from different manufacturers (3 in the US) – because until the vaccine there was a Maloch Hamoves killing and causing sickness to tens of millions of people from covid. The vaccines stopped it.
Maybe there is a chiyuv of shehecheyanu.
Masks are just a inconvenience to wear and if it helps protect immunocompromised people from getting sick then it is best to wear it.
Some distrust is healthy suspicion. Too much is conspiracy theory territory.