For the left, birth control, abortion, and preventing any birth of babies, save for maybe one is a moral and central issue. It is their Malthusian belief system that requires them to limit the number of people in the world. The end justifies the means, despite being proven otherwise, the left will cling to the scientists and philosophers of the 1800's even to the disastrous end. There is no reasoning, no example of failure can dissuade them, despite the lack of real benefits to their beliefs they're own ability to imagine are good enough. Their beliefs are all that matter.