If I sprayed your salad with some "RAID" roach killer right now, just a little bit right on the lettuce and maybe a little more on the tomatoes, would you still eat it all, and just assume your body will simply filter out those "small amounts" of toxins?
Better yet, what if I paid for it, a nice big, tasty, "bug killer" salad that you could even take outside and no bugs would bother you at all, would you eat it? How about this: If I sprayed a quick shot of some Raid ant killer into your orange juice or your apple juice right in front of you, would you drink it, especially if you'd save 25 cents on every drink you drank from now on?