Pffft...Unions.
You'd be bitching even more if the cabins were not disinfected adequately.
I don't blame them if adequate protective measures have not been taken: training, gear, and manpower. It takes time and money to get the bugs out. If the airlines don't want to commit to that they don't have to fly to Liberia.
There are other ways to institute a travel ban, liability being one of them.