Packaging Design Ethics

I don't know why I keep on posting these ethical topics, but here's some food for thought . . . I found this article in TIME magazine that talks about companies doing the most marketing on their most unhealthy cereals. I thought about two things: (1) Damn, I love Lucky Charms, but (according to the Rudd Center for Food Policy and Obesity) I should find other sources of magically delicious foods. (2) The design of the packaging and websites along with the production of the commercials are critical components of the marketing for those cereals. With that in mind, UB's MFA program covers those areas, and I always hear professors say how rewarding package design is. So if we consider a career in package design, whether it be cereal or cigarettes, at what point does the "you can't be designing ish like that" light kick on? It seems everything you eat and look at gives you cancer or makes you unhealthy. Do the designers take blame on some level?? I mean, I know I want to have kids soon and these may be some issues I have to face. And maybe one day, I will be designing cereal boxes, who knows? I know most things are ok in moderation, but who wants to be the dad that designs the cereal box of the cereal that contributes to child obesity across America? Where do aspirations and ethics meet?