In this article, this is cultural relativism. In each culture, there are different views about abortion. Not like us, each tribe has its own issue about health and living thus we have to think from their point of view. There is no reason for us to judge them by our own standard even though their actions are so absurd. By contrast, we have to respect them.
In some cases, people even take abortion as a sacred ritual in some tribes. They even do not understand why the outsiders think abortion is immoral because this thought is already deep inside in their minds.