Boy flees Mexico to avoid chemo due in part to religious beliefs.

[lrh9]

Ah. You mean the advances that have allowed more people to exist and live longer. Natural selection can even overcome those. It is possible that increased resource consumption by growing populations will eventually cause a depletion, which would result in mass famine. It is also possible that increasing population density could lead to increased crime - including homicide. It is also possible that technological advancement could lead to the invention of super weapons that would destroy our entire species. So make no mistake that our beliefs and our behaviors are still subject to natural selection.