There is evidence that pesticides, hormones, and antibiotics are unhealthy. There are some scientific papers right in this thread. EWG has also done studies measuring levels of pesticides in the human body. Having "only" a few percent of LD of a given pesticide in your body is not exactly healthy.
To make it easier: take a week's worth of food, all organic. Let's say you have already eatten it. At the same time, take the pesticides those foods would contain if they were not organic and put them in a glass. Now tell me if drinking a weekly glass of pesticides in addition to your food is congruent to not drinking them..............