In ancient history, human sacrifices were made on a hill above a river. Thousands of people. The sacrifices were made and the bodies were burned on a pyre. After hundreds of people were sacrificed and burned, a thick white discharge crept from the altar, downhill to the river.
Rain fell on the burnt pyre year after year, and year after year, people were burned, and the rain seeped through the wood ashes to become a solution of lye, and the lye combined with the melted fat of the sacrifices, and a thick white discharge of soap crept out from the base of the altar and crept downhill toward the river.
Where the soap fell into the river, after a thousand years of killing people and rain, the ancient people found their clothes got cleaner if they washed at that spot. You have to see how the first soap was made of heroes.
Think about the animals used in product testing.
Think about the monkeys shot into space.
Without their death, their pain, without their sacrifice, we would have nothing.