(and reduce the likelihood of transmission - and, as the WHO have said, also of mutations developing)
By how much?
We are talking about mandates for pharmaceutical products which are being used under conditional marketing authorisation and which have not finished their clinical trials. On which we do not have long term safety data. IMO you would need to have pretty good effectiveness against infection and transmission in order to justify that (and you would need decent longevity).
The latest info from the European Centre for Disease Prevention and Control is saying that some early data shows a 37% rate of vaccine effectiveness for the booster against Omicron (and that is not counting for waning over time).
So what's your figure? What's the number where you start to say that mandating vaccines cannot be justified? Maybe for you there is no number - maybe you are OK with mandating vaccines with a 37% immediate effectiveness which can only wane over time but many people are not.
And that's for boosters. 2 doses had a vaccine effectiveness rate of 6%.
So the mandate is for an immediate effectiveness of 6%. That's pathetic.
You can read the study here www.medrxiv.org/content/10.1101/2021.12.30.21268565v1.full.pdf
Conclusions
Two doses of COVID-19 vaccines are unlikely to protect against Omicron infection. While VE against Omicron infection is substantially lower than against Delta infection, a third dose of mRNA vaccine affords some level of protection against Omicron infection in the immediate term. However, the duration of this protection and effectiveness against severe disease are uncertain. Additional tools beyond the currently available vaccines, such as public health measures, antivirals, and updated vaccines, are likely needed to protect against Omicron infection.
Like the doctor said - the science is just not compelling enough for this mandate. If the government has any sense (and integrity) they will use Omicron to backtrack by admitting that it is a game changer and they are updating their policy to reflect that.