Does this "would" refer to "a habitual action" or "future in the past"?

gp52) Recently people have found a smiling face on the surface of Mars...The phenomenon that allows people to see the image of a person or a thing in another object is known as "pareidolia"....So why does this happen? Some scientists believe that pareidolia is a trait that we humans developed through evolution to help us survive. A million years ago, babies who were unable to recognize their parents' faces smiled back less, and were less likely to be loved by their parents. This would make them less likely to survive. So, it would seem that the ability to identify the human face is hard-wired in our brains...