I can agree with that. While I don't like the idea of using insecticides in garden, or on poultry, the bottom line is this: some times it's necessary. And, I will fess up. I've used Ivermectin pour on to treat mites in my birds. After doing a bit of research, it is used in limited applications to treat human parasitic infestation. Yet it is not approved for poultry. A quick net search did not result in any use of Sevin or Carbaryl to treat any human issues.
Do your homework and choose your poison accordingly.