Let’s recap the story as it is currently told. The land suffers. Crops fail, hunger and misery are rife. The king lies wounded. Heal the king and the land will recover.
Do not ask what role the king played in turning the kingdom to wasteland. He and the land are one. It suffers because he does. Do not ask about exploitation, or the way wealth flows in opposition to water, from low to high.
Do not ask for the name of this king, or else you may reveal his specific failings. This could then cease to be a tale about asking the right question to heal the king. Ask the wrong question and you will damn him forever. He hopes you are persuaded that without him, the land is lost. It is better you do not ask.
Once upon a time there were wells and well maidens who gave water and life from their golden cups. Do not ask where the wounded king got his grail from. Do not ask why there are no more wells and no more well maidens. Do not ask why the land is so dry. Power flows uphill from the weakest to the greatest and the king demands that he alone matters in this story. Heal him, and only him.
Do not snatch the golden cup from his rotting hands. Do not run in search of the old wells. Do not lower the grail to bring up fresh draughts of water, cool from the dark embrace of earth. Do not offer water to all who need it. Do not imagine that the real world can tolerate anything as naive and generous as a well maiden.
Just keep telling the story the way the king says it has always been told. He wants to fester in his authority and he wants you to feel sorry for him. You, who have the power to take his chalice and go back to the source.