I can't name 1, neither can you....that's my whole point. How does being tolerant of someone's beliefs help humans evolve ? It doesn't. Diversifying the gene pool is what helps us evolve and transgenders cant/don't. Actually maybe I'm wrong about that, maybe that's how evolution is working by not allowing people with mental disabilities procreate it removes it from the gene pool.
You're thinking about this in the wrong way. We are far beyond needing to worry about diversifying the gene pool to help our species survive and evolve. This isn't 10,000 years ago when that actually mattered.
We are at about 7.5 billion for the human population and will be around approximately 8.1 billion in 2025 and about 10 billion by 2050.
We actually need to slow down reproduction. Population is already a big problem and will only get worse.
The next steps in human evolution won't have much to do with natural selection, it will be genetic engineering. We have already been using genetic engineering with animals and plants for decades. And with CRISPR, one beneficial application is lwe can use it to change mosquitos so they cannot transmit diseases such as malaria. With advancements in
CRISPR and other technologies, we can, right now, edit genomes and that means it's only right around the corner before "designer babies" is a reality.
Crispr-Cas9 has already been used to genetically modify human embryos in China. The technology is advancing and is absolutely inevitable.
And that's going to be great - we will completely wipe out hereditary disease. Many forms of cancer and various thousands of other conditions will be a thing of a past. Like all technology, there is a downside too, double edged sword, like at first it will only be available to the rich and they'll have their perfect 6'5 blonde hair blue eyes babies, or whatever is most fashionable, but in the long run the benefits will outweigh the bad and it will advance out species in ways we cannot even imagine yet.
Genetic engineering and human biotechnology are our future, barring any immediate catastrophic event like all out nuclear warfare.
Diversifying the gene pool means very little at this stage of mankind. We will have the tools, and already have them to an extent, to evolve our species. This isn't a question of maybe or what if, it's when. Its undoubtedly inevitable and there isn't anything that can stop it.
So what does it matter if transgenders can't reproduce the "natural" way? Millions of non-transgenders are the same, whether by choice or not. That doesn't matter to our species whatsoever.
I would argue homosexuality is pretty damn normal if you look throughout history, from modern times to the ancient Romans and Greeks and every other society. There's always a percentage no matter what region that is gay and bisexual. Likewise, transgender had been around for thousands of years, from the Americas such as American Native tribes having third-gender roles, throughout Asia in particular the Hijra in India and so on. So we know this has always been apart of mankind, even sexual operations have been around. Eunichs? Yeah, we've been cutting off balls for thousands of years, which of course has major hormonal consequences. Shit, this goes back at least to the ancient Sumerian people in the 21st century BC (over 4,000 years ago). That's a long fucking time of castration, many if this became a "third sex". Of course, Eunichs have had all sorts of purposes throughout history, the Bible talks about them all the time, some are slaves, some military, servants, etc and some simply are men wanting to be women and some are a third sex which has had various different meanings in different places and times.
So really you can see it doesn't matter now and it didn't matter thousands of years ago. The society we live in tells us what's "right and wrong" and that changes entirely depending on the time and region you're in. What is weird to us now, in the united States, isn't weird in India or in Ancient societies and that will change yet again, where in 200 years, we will be so drastically different from now our views will be considered ancient and backwards.