I look at this article from a few points of view:
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1) Why does it matter if I choose not to have kids? It's not selfish on my part, it is merely the choice that I made. I don't condemn people for having children, but yet I am vilified for not making the same choice.
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2) People who have children look at non-parents as abnormal, but also with underpinnings of our choosing to not have children as a reflection on their choice. Not having children reflects only myself. We are not trying to hold a mirror up to society and say, "Look. See what life could be like without kids." There is no hold-out bravado attached to me not having kids. Yet, many people who have children take it as a personal insult if you don't have them. I find this quite bizarre. We have been itemized, categorized, and vilified without stating more than, "No. I don't have children."
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3) Childlessness is now an option. How many people in years past made the decision to get married and have kids because it was expected of them? A lot. This feeling is not new. It's not a trend. In our great country, women can choose not to have children or get married, and more and more women are choosing this lifestyle. Women and their uterus are not chattel, and thankfully we can lawfully make our own lifestyle choices.