They can not claim anything without data and evidence backing it up. Doesn't mater how "sure" they personally are - for all we know the scientists could know 100% that it prevents transmission, but it's not proven, they can't make that claim publicly.
Isn't that the very definition of a fact. Something that is proven by scientific data? Prior to there existing scientific data, you have suspicion and speculation. First they speculate that it might be so, then they have the suspicion that it is so. Then they have the data to prove that they were right. So telling everyone that it does something, when quite clearly there is not proof, is speculation.
And if it is proven to save lives, then why not make it compulsory to everyone who wishes to interact with other people? I'm not saying stop people from going for walks in parks or going to the cashpoint machine, but at what point does it become unacceptable for people to take deliberate actions (refusing a vaccine is a deliberate action) that they know will kill people who cannot be vaccinated for medical reasons?
Or are we saying everyone should be allowed to do what the F they like, and we should all just fill threads with vitriol and condemnation without ever postulating some sort of solution?
Absolutely no-one should be permitted to work in any front facing role in the care community without a vaccine. All roles where the victim has no option, the staff should be compelled to be vaccinates. If someone is in hospital as a result of a car accident, renal failure, whatever - all staff who care for the elderly where the elderly are clearly vulnerable and have no choice - anyone who cares for children where the children have no choice but to be there - we need to get to a point where all the staff are given vaccines. If they refuse you issue them with a warning that you are aware that they are knowingly endangering the people in their care and should not return to work until they are willing to work in a manner that does not endanger the care of the people in their care. If they then refuse to take action you sack them.
But you cannot do anything without scientific fact, and it is really hypocritical for people to throw around vitriol and disgust based on zero facts, and still suggest people should have freedom to choose when those choices are already known to kill.