What is something they say happened but never happened actually?

There was no second incident in the Gulf of Tonkin. It was fabricated to start a war with Vietnam.

Microbes being proven to cause disease

Men didn't really go to war for women. That idea is mostly a myth. Wars were fought for much more practical reasons like land, power, resources, or politics. The whole 'fighting for women' thing is just a romanticized way of making war sound more appealing and help men feel more dedicated to the cause.

The Holobunga

She took his spores. All women are whores.