To play devils advocate, most large companys with health and safety department that is corporate/ legal focused, take the view that if there is a chance you may be mentally impaired or distracted due to what ever personal/professional circumstances, and you are in a profession where you can harm yourself or others, then you don't work.
So, presumably, that situation existed immediately after the standown advice ...when all aircraft were on the ground ... but NOT immediately after the FWA decision... when aircraft needed to be put into the sky.
Pretty clever Pyschs they have ... Qantas and CASA!