This is nonsense, it’s obvious what type of safety OP meant. I have no idea what could be irresponsible about not including contrived, ridiculous scenarios.
It’s like saying he also should have accounted for the possibility fairies will turn you into a newt if you edit a gene, or into a rabbit, or if a wizard will turn you into a newt. You can make up an infinite amount of this bs.
I’d prefer my ATC has a cup of coffee if they want it.
Aside from that, what does what happens in their off hours matter provided they’re coming to work sober?