While I agree with your article in general, this number is almost certainly far, far too high.

The Amnesty International article you quoted gives no source for this number.

More, there was a recent peer-reviewed study that showed that intersex births were much higher than had previously been reported - at 0.13%.

That's less than a tenth the number that Amnesty International claims, without proof or citation.

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As a leftist, I also deplore your reasoning. The reason to treat transgender people right is not that they are so common - it's because it's the right thing to do!

it would be the right thing to do if there were only one trans person in the world.

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This is an important issue. It isn't served by making dramatic claims that can't be substantiated.