it's not that they want abortions themselves (obviously). Lesbians have rejected their God-given sexuality, and thus what their reproductive organs were made for. Because of deep-seated emotional issues, these lesbians (especially the activist ones) are opposed to much of what defines true feminity.
The ultimate act of feminity is to bear children. Thus, you have an allegiance between lesbians and anti-life forces to do what they can to destroy this aspect of true womanhood.