Given how the efficacy of masks repeatedly changed in narrative day to day, from no effect, to total effect, and middling on occasion between, it seems to have been f force on, at best, faulty information.
This alone ought be enough to say it shouldn't have been done, even aside from liberty aspects.
There seems to be no benefit at all, as far as I've seen, for children. That move seems to be a result of political fearmongering and uninformed paranoia.
For myself, I was skeptical from the start of such practices, both in terms of their efficacy as well as the power grab.
Time seems to have supported my disillusions. The state demonstrates why it shouldn't be trusted with such matters as health. Money and influence make way for truth, and fear becomes currency to buy power.