The purpose was ethnic cleansing. If you kill the unborn babies, along with the born ones, and either make the child bearing age women infertile or dead, then you don't have to worry about them breeding and making more Muslims to pollute your Christian Nation. A member of the Bosnian War Crimes tribunal came to talk to us in law school and he told stories about what happened that were horrible. It was a systematic attempt to not only kill all the Muslims that were alive then, but make sure that they would not come back later.