Not sure what your stance is, so this isn't directed at you or anything... But imo government has the duty to protect the rights of all individuals. In the case of abortion, it is determining whether or not you consider the unborn entitled to those rights.
Being a biology major I hate when people say a fetus isn't living or whatever. It is def is without a doubt considered living, so how some people distinguish between living and non living is very ambiguous. I always considered myself pro-choice for the longest time, but after really reflecting on the issue I am not sure what I believe.