The red light comes on - land, don't accept another tasking.
You've oversimplified the most important point of all. THIS ISN'T WHAT HAPPENED, that is a matter of record. The red light didn't just come on. It was on and off several times before becoming permanently illuminated, then the second one came on, but the previous intermittent warnings dilute the message. And there is evidence they may have been contradiction with other indications. And who knows what history there had been before with lights coming on, being acknowledged then extinguished. As someone already said, a goofy fuel system.
If he had taken your advice he would have made at least 5 precautionary landings on this sortie alone. Madness.