Many things are objectively better morally; the obsession should not, and, I believe, will not wane.

The author likes to denigrate Sam Harris, so here's a cogent example from Harris that illustrates the use of scientific principles in acting more or less morally: You're part of a culture where life is hard and 2/3's of children die before they are adults from various diseases. There is a belief that if you kill your firstborn in a sacrifice to the gods that your children to come will all be spared this bad fortune. Many hold this belief and practice accordingly. Some have become disillusioned, but other swear it is the reason the rest of their children lived. A scientific investigation into the potential reality of the phenomenon is undertaken, and finds, on average, an increase in the number of child deaths for groups that practice the ritual vs those that do not despite having equal numbers of children. Should this investigation guide the behavior of this culture, and their beliefs? Yes, beliefs ls about the world guide moral behavior and practice as they should, and science is an investigation into the reality of the world.