Staunch abortion foes make the argument that women should not ultimately decide what to do with their pregnancy because of a greater good, which is, in their minds, an absolute sanctity of life.
But they don't go into great detail about the practical effects of their position, about just what it would take for society to enforce laws that said women must take a pregnancy to term even if they don't want to, i.e. give the government license of a woman's body.
The same thing can be said of the scientist who is claiming that we shouldn't have the right to have more than 2 kids because of a population explosion. He does advocate for better education and opportunity and contraception use, but to say we don't have a right to have as many kids as we want, that takes it to another level.
If we don't have the right, how is society supposed to enforce it? What laws and customs must be put into place so that as few people as possible violate that belief?