An old man and his mute niece always wanted to visit some beautiful tropical island.
"Before my sight leaves me, I want to see how a real palm looks like!", said the old man. He was lying. His sight had already left him, and he could still see silhouettes and shadows, but communication in sign language with his niece was getting more and more complicated.
Nevertheless, they decided to go.
They left on a small boat, one of those tourist trips on a sailboat. There were 10 people on the boat, including them.
They were approaching a very nice archipelago when it began.
A storm, a powerful one, overturned the boat, leaving the crew in the ocean to struggle for life. The niece, although chubby and weak, managed to rescue her grandfather and reach a deserted little island in the archipelago with other 3 people. The sea halved them, but still there was hope.
Days passed with very low food. Our two tourists were weak and hungry and only a little water supply was available. After a week one of the man said that he would begin to hunt for seagulls, of which the island had a lot. The old man only saw a big black cloud talking, the salt and sand had only worsen his sight, and, beaten by hunger, promptly said "Yes...please...".
Apparently, the hunter was a very good one. Finally they could eat something, and could also eat it cooked since a fire was lit up by one of the survivors.
A few other days passed. The seagulls were manna for them, but not enough to give them strength to move. All the day the old man sat beneath a palm thinking "This is not how I wanted to see them...".
Suddenly a great "WOO" echoed in the archipelago. A cruise ship. A cruise ship! They waved vigorously, everyone beside the old man, he was too weak. The ship arrived and collected them all.
"We are safe!" thought the old man. Then, with his heart in peace, he fell asleep, only to wake up in the medical wing of the ship.
"Come, my friend, it's time for you to eat something good!" said the captain. They went to the restaurant and the old man couldn't believe his eyes and almost cried to the signboard at the entry:
TODAY'S SPECIAL: SEAGULL MEAT!
"Well, at least it will be well cooked," he thought. He cut the meat and tried it. A tear slipped on his cheek. He stood up and went to the deck of the ship. He climbed over the railing and jumped off the ship, giving to the sea another victim.
Why did the old man commit suicide?
DISCLAIMER: I wrote this riddle long on purpose. I think an interesting story behind enhances the fun.