In my opinion, pesticides are pesticides, it doesn't matter if they are from an natural source or synthetic. Just because the pesticides used on organic produce are from nature doesn't make them any safer/better. There are lots of things in nature that are harmful to consume. Look at Rotenone. It was a popular organic pesticide for a long time, which has been recently banned due to it's health risks.
Also since Organic farmers don't use Genetically Modified Organisms they often have to use MORE pesticides than non-organic famers.
As far as milk goes, I don't think organic vs. non-organic makes a difference. I'm not against drinking milk, however I do think we consume too much of it. Someone mentioned the hormones given to some cows. But what about the hormones that are naturally there? The hormones that are meant to produce milk that will grow baby cows into big adult cows. We're not cows, we don't really need it. We're the only mammals who continue drink milk into adulthood. We're also the only mammals who drink the milk of another mammal. So if you're really worried about the hormones you should stop drinking milk all together.