Ben and Jerry's ice cream is a drop in the bucket. If B & J uses breast milk, what about the dozens of other ice cream companies that will still use cow's milk? What about ALL of the dairy products we consume e.g. cheese, milk, cream, butter, yogurt, etc. As I said B & J isn't going to solve the problem. What problem??
Okay, here's a math question: How many women pumping breast milk will it take to to satisfy the demands of the entire dairy industry? And if a woman is lactating, isn't she using her milk to feed her own child? The whole idea is absurd. This is one of the reasons so many people find PETA a joke.