The science on masks is very weak. The claim is that you might spread Covid-19 without knowing, if you have it asymptomatically. The virus is allegedly stuck to big droplets which the masks catch, and it is therefore assumed that masks can stop the virus spreading.
Firstly, asymptomatic Covid-19 spreading around is good because it reduces the virulence of the virus. Secondly, the idea that masks stop the spread is not only totally unproven, but also facile. It is a failure of imagination. When a droplet hits a mask, it will dry out within seconds or, at most, minutes. If there is any substance to the droplet other than water, it will turn into a dust particle. Unless you superglue the mask to your face, there will be a constant rain of dust particles coming out from all directions around your mask as you breathe. They will be breathed in by others and the virus will do what it does.
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The bottom line is that our government should not be in the business of copying totalitarian states and pushing compulsion on people without having jolly good evidence on which to base it. That is the fundamental philosophical divide about this.