The car service which takes you to/from the airport, hotel at which you stay, restaurants at which you eat and car rental company at the destination, don't generally offer bereavement rates, why should air carriers?

So, why is it unreasonable that any discount is offered?

None of this is to suggest that it isn't a bad thing that one can't afford to travel to a close relative's funeral, but there are many much harsher realities in life.