Whether you like or dislike their particular choices, the very fact that they censor breastfeeding mothers means that they are accepting moral responsibility for what they decide not to censor.
I do not accept the statement that they “Abhor Nazi ideals and find Holocaust denial repulsive and ignorant. However, we believe people have a right to discuss these ideas and we want Facebook to be a place where ideas, even controversial ideas, can be discussed.” Where was that line of thinking when they censored breastfeeding?