Would anyone dispute that bacon and sun exposure are risk factors in cancer? Contrary to his assertion, Australia also ran a pretty well-funded campaign against sun exposure in the 80s and 90s.
The reasons why bacon and the sun aren't banned are simply that the former is that eating bacon is a decision people can take individually, and banning it would intrude on peoples' lives and culture much more strongly than banning a pesticide. As for the sun, it is really hard to ban, and has been shown to have benefits that counterweight the cancer risk.
Mocking the risk designation of "working as a hairdresser" is similarly hair-raising: Hair-dressers handle all sorts of chemicals, such as colouring agents. I wonder how easily the author could be convinced to expose himself to the lifetime exposure of a typical hairdresser.