A funeral Mass is for a specific deceased person. If no one arranges the funeral then there isn't a funeral. How would the parish priest know there was an aborted child in his parish unless someone contacted him and told him? Funerals also presume the presence of a body or remains, otherwise it is just a Mass for the deceased.
Your non-Catholic friends can rest assured that when there is an opportunity to have a funeral for victims of abortion, the Catholic Church does do so:
17 Abortion Victims to be Buried in Catholic Funeral in Michigan
And there are Catholic memorials for abortion victims as well:
Memorial sites for abortion victims
Why doesn't the Catholic Church have funerals or memorials for aborted children?
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