A human body is incredibly useful no matter how lazy/fat/stupid.
For one thing, you can use their meat/fats for sustenance.
Another use is that their bones could be used for tools. The skull makes a nice chalice. The femur and humorous make great weapons if sharpened. The scapulas make great shovel heads. The teeth/finger/toe bones make great jewelery. Bones can be used to make soup as well. You can also consume marrow. There are still more uses for the bones.
Their fats can also be made into a candle.
Your point has too many flaws, and is therefore invalid. :l
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