What you are seeing is the effect of acceptance and awareness, not overly broad diagnostic criteria. It's not reasonable to extrapolate from these rates to half the population.
We are talking about human brains and psyche here, not much is known, and it's hard to conduct falsifiable experiments. If this upsets you, don't concern yourself with such endeavors, who asked you? Not every truth is found through the scientific method. Others are telling you that their diagnosis gave them peace and understand, a foundation on which to build an identity. Why are you here trying to take that away from people? What is your reasoning for making these arguments?
We are talking about human brains and psyche here, not much is known, and it's hard to conduct falsifiable experiments. If this upsets you, don't concern yourself with such endeavors, who asked you? Not every truth is found through the scientific method. Others are telling you that their diagnosis gave them peace and understand, a foundation on which to build an identity. Why are you here trying to take that away from people? What is your reasoning for making these arguments?