As most of the world still struggle to find enough protective masks to help stop the spread of the Covid-19 pandemic, the launch of the Hong Kong government’s free reusable masks earlier this month for the entire population should have been welcomed with open arms. But one of the main criticisms is: why so late?While the free masks would have been more appreciated at the start of the outbreak early this year, when mask shortage was at its worst, we need to understand that the mask is actually a…