There is some evidence to suggest that the Saudis were involved in setting it up. Beyond that, there were endless conspiracy theories, none of which were widely believed. I’ve talked about it with a lot of people over the years and have yet to meet a single conspiracy theorist. The vast majority have never believed in a 9/11 conspiracy.
A Tilley LTM8 to keep the sun off my head without holding in heat. They aren’t exactly stylish, but they work well and seem to be nearly indestructible.