It is, mainly because the history of pesticide research has basically been looking for the least harmful pesticides to humans. Before DDT went into wide use in

It is, mainly because the history of pesticide research has basically been looking for the least harmful pesticides to humans. Before DDT went into wide use in the 1940s, aersnic based pesticides were common. Here's a particularly nasty one that was commonly used up until DDT replaced it. https://en.wikipedia.org/wiki/Lead_hydrogen_arsenate?wprov=sfla1 https://en.wikipedia.org/wiki/Lead_hydrogen_arsenate?wprov=s...