I agree. Potatoes by themselves are not bad (unless you are diabetic.) One thing for certain, if you eat potatoes, for the love of God, don't fucking peel it. The skin on a potatoe is choked-full of nutrients.
Potatoe chips and poptarts are not bad when eaten in moderation (.ie. as part of a cheat meal or snack on top of an otherwise healthy diet). It's when people eat the whole damned box of them that they become a problem - or when they make that type of stuff the central part of their diet.
Kinda reminds me of an episode of "King Of The Hill" where Hank is ordering food (and he was prescribed by a doctor to eat green/veggies) - he ended up ordering lassagna for greens.