If you believe that, then you have not confronted the toxicity of the pest resistance chemicals that plants produce themselves. They're nasty, they've been proven resistant to mutation by natural selection, and they are produced in higher concentration when the plant is attacked.
I’m not really sure what that has to do with the pesticides that have been demonstrated to be poisonous to people, for example.
Farmers who work with pesticides have a higher incidence of diseases that are correlated with such.
The question is what is the safe, cumulative exposure to different pesticides.