Because it only talks about what ordinary powerless people can do to mitigate the danger of the virus. The system is saying nothing about what corporations must be made to do to combat the risks to public health - primarily, they must be forced to stop polluting our food, air and water. It is corporate activity that is the primary source of people's ill-health, not other ordinary people neglecting to wear masks.
The same applies to capitalism. It talks only about what ordinary people must do to better themselves - work harder. It says nothing about the parasitism of corporations, which is the real source of people's poverty.