Organic food has higher nutritional value and mineral content. The human race survived for approximately 100,000 years eating only organically grown food.
Carcinogenic herbicides and pesticides were invented only in the last 100 years.
And now the Earth's food supply has been industrialized by major corporations who value profit over human health and survival, as evidenced by their invention of things such as the 'terminator seed.'
(Monsanto sells this genetically-altered seed to farmers, especially in poor regions. The seed will only produce one year of crops. So, farmers must buy it each year. This is a crime against humanity and nature.)
Fortunately, a huge underground farming community has emerged, and many people have preserved heirloom seed - seed strains from hundreds of years ago, not altered by humans in any way. There is a new generation of seed savers and traders that understand NO FARMS = NO FOOD.
Plants evolve immunity just as animals do, and stronger food makes healthier animals. Nature knows best.