Why Do People Think Their Are More Than Two Genders?

No, you misunderstand what I said, I said that in some cultures, bad things have happened.

Then I said that the basic biological principle of two genders has been around for longer than humanity. 

Culture and humanity two different things.

that's culture, not biology. Word your arguments better.

As someone going through the backlog of these posts since I'm a new user, it gets really old really quickly. Each conversation doesn't have a new aspect, it's the same played out "two genders" "sex isn't gender". People aren't even going in depth.

There are only 20 or so active members. It's all been hashed out and topics get repeated over and over again.