Breast milk for ice cream?

Instead of cow’s milk, the People for the Ethical Treatment of Animals is asking ice cream maker to begin using breast milk. I wonder what the taste would be. They wrote a letter to company founders Ben Cohen and Jerry Greenfield telling them cow's milk is hazardous and that milking is cruel. Ben and Jerry, however, think that this idea is bizarre. What do you think about this issue? Isn’t it weird? Who would donate breast milk?