Herbicides are useful, they certainly help prevent invasive weed species from taking over native plants and grasses. I'm Kentucky I'm always fighting Johnson grass, thistle and Japanese knotweed in my bluegrass
Wrong.
See, e.g., https://www.fda.gov/food/chemical-contaminants-pesticides/pe...
“Pesticides are used in agriculture to protect crops from insects, fungi, weeds, and other pests.”