How about a medical reason? How about a drug addict who may have a sick child which may die after birth? How about a homeless person who can't support the child? How about a woman who is too young to properly care for and provide for the child?
There are so many reasons people choose to abort. I will happily pay taxes for that. Just as I pay taxes for students to get an education. Many will piss away their opportunity in school, but I still pay all the same, and I do so with pleasure.