I felt the same way about "organic derived" Pyrethrin products untill a couple months ago, when I started researching pesticides
I wanted to know what was safer for the medical Mj card holders I grow for, Pyrethrin products or Neem Oil 70%, this is what I found........

The manufacturers of the Pyrethrin products only say there has been no substantial testing to support any problems with humans and Pyrethrins....but there is a whole lot of people that say they are lying, cause they are real sick from Pyrethrin Poisioning
True Stores of Pesticide Poisoning - very many are Pyrethrin products Pyrethrin dervitives...head lice products are a common one

Neem Oil it seems is a terriffic product ,will dispense with most bug , mould & disease issues...... its safe , it beaks down biologically by exposure to sunlight, wind and humidity with absolutely no adverse effects to the environment. & some neem products can be taken internally, its the number 1 birth controll method in India, it's claimed by eastern medicine for centuries to cure hundreds of illness, afflictions , prevents sexually transmitted diseases, bacteria & pests & can be used up to the day of harvest on fruits, & vegtables..........not that I recommend anything on your buds the last 3 weeks.

Personal choice.....but, remember what they said about asbestos,tobacco and a myriad of other items they made money on.