Why do you think Gan ultimately tries to con T'Gatoi that Terrans should be shown the birth process he witnessed? What seems to be the basis of his conjecture that Terrans should observe this process?

From the text:

I had been told all my life that this was a good and necessary thing The and Terran did together—a kind of birth. I had believed it until now. I knew birth was painful and bloody, no matter what. But this was something else, something worse. And I wasn’t ready to see it. Maybe I never would be. Yet I couldn’t not see it. Closing my eyes didn’t help.

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“Terrans should be protected from seeing.”
I didn’t like the sound of that—and I doubted that it was possible. “Not protected , I said. “Shown. Shown when we’re young kids, and shown more than once. Gatoi, no Terran ever sees a birth that goes right. All we see is N’Tlic—pain and terror and maybe death.”