A debate among many people of a more conservative, traditionalist bent is that being gay and being transgender are mental disorders. Despite the protestations by pediatricians and psychologists that they aren't, they insist that the pediatricians and psychologists are being political and not disinterestedly seeking the Truth.
However, there is a way to settle this question. Are there any gay or transgender hunter-gatherers?
It is known among anthropologists that mental disorders simply do not exist among hunter-gatherer tribes. Not schizophrenia, not bipolar disorder, not PTSD, etc.... Therefore, if hunter-gatherers do not have gay or transgender members, then that would be a slam-dunk proof that being gay and transgender are mental disorders. And if hunter-gatherers do have gay or transgender members, then that would be a slam-dunk proof that being gay and transgender are not mental disorders.
What is the verdict among anthropologists?