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The "scientists" in question didn't think anyone would consent so they chose to experiment on people without seeking consent. They knew that normal adults would ask too many questions so they used cognitively impaired children. They did this because they didn't think of developmentally disabled people as fully human.
Look, MIT has already decided that this was a horribly unethical thing to do. Its professors practically scream that in classes. And it paid off the victims with $2million. MIT thinks this is unethical. So why are you disagreeing?