People who do not approve of specific forms of birth control are primarily deeply religious individuals. Their argument is that he disagrees with their philosophical concepts, the main one being having sex before the couple is married. Not everyone has the same beliefs and Americans are protected by the First Amendment to the Constitution, so those who oppose it don't really have an argument to try to pass a law stating that it is illegal to use some forms of birth control. In this book, no one is against any form of birth control. This is probably because they are all rich in soma and don't know much different. Citizens of the World State are conditioned to look down on those who become pregnant and to exclude these particular individuals from their lives in order to reprimand them.