I’m afraid preservatives are part of the high price of convenience. In order to be able to get food items that are already made (heat & go), they use preservatives. In order to get food items from outside of the local area, they use preservatives. In order to mass-produce high quantities & let the stores have them on the shelves long enough to sell rather than throwing out spoiled items, they use preservatives.
That said, I would certainly prefer to have whole foods, organic foods, preservative-free, hormone-free, pesticide-free foods, but have found that they are cost prohibitive.
I try my best to avoid what I consider the “worst offenders” (for example, I buy milk that is certified hormone-free, avoid trans-fats, avoid artificial sweeteners) and don’t put every food label under a microscope. My personal opinion is that having an active, healthy lifestyle in general is more important. So I think it is ok to have a piece of chocolate that has some preservatives every once in a while as opposed to eating like chocolate is one of the “major food groups.”