reasons:
parents will not be able to take care of the baby - why not offer the baby for adoption?
Raped? - does the child deserve to suffer the consequences(abortion) what his father done to his mother?
Overpopulation: there are lots of option/methods of how to control the growing population however ending the life during/after pregnancy is unjustified option. If the method you used missed be responsible for it and not just simply ending the life inside the womb after you enjoy and fulfil your selfish desires.
Depletion of natural resources and global warming? babies are innocent from such problem why not blame the adults?
not allowed by religion is not the reason rather it is poverty, expect an unemployed parents who both stays 24hours in their home will probably have more frequency doing sex compared to those who are employed.

Selfishness what makes everyone choose pro abortion.