Because every fuel that burns is bad for you.
Kero is considered to be SAFER, not safe at all! Nothing is safe.
The reasons why kero is considered to be safer has very little to do with the fumes or it's toxicity, as they are all bad for you in this regard.
Also 'pure' kero is a misnomer, its a bunch of carbon molecules of roughly the same properties all mixed together, thats the way petroleum products are made. Looking at the MSDS, there is very little difference between 'pure' kero (aviation fuel) and normal kero and solvent 3440 special.
Kero is considered 'safer' as it has a higher flashpoint than a lot of other fuels, and it burns at a relatively 'low' temperature, compared to stupidly dangerous fuels like petrol, which tend to be much more carcingogenic too.
At no point should anyone in the world decide to spin fire thinking it is 'safe'. Pretty much every fuel that burns is toxic.
The fumes you breath in while dunking are toxic, the splashes you absorb through your skin is toxic, the substances given off when it burns are toxic and you will have a certain amount of ash in your lungs if your nose hairs don't filter 100 percent of it.
It's pretty much unhealthy the whole way, not even including accidents.
I'm not even sure why we do it really...
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