Also, abortion isn't just "oh, a baby, I don't like babies, let's kill it". You need a good reason, and there are a lot of good reasons:
Stolen
Accident (ripped condom, the pill for whatever reason not working)
Not being decently educated about the subject a baby would only increase the misery of an already miserable life.
Studies + Babies don't mix, pregnancy increase the amount of hormones and also means you will have to leave school for at least a week, this is a disaster when you're in university, and as I hope you all know, university also costs A LOT of money.
The father suddenly leaves.
Death of the mother upon birth.
The baby is diagnosed to not live long or it'll have an incurable and terminal disease, nobody will adopt it, and you're left with something you can't possibly raise because you don't have the money, lack of social security means you will not be able to raise it, at all. So instead of "killing" something which wouldn't live long anyways, you've suddenly ruined another life with it (this is the case with most of the examples anyways).
Seriously, growing a baby just to give it up for adoption isn't easy, the hormones, the effects on your body, the social prejudice, it isn't easy. Nobody, and I mean NOBODY wants to kill a baby for fun, abortion isn't just something you do, it's something you need to do. Of course it's not always justified (in which case it shouldn't be done), but even if the system's abused, it's better to aid those who actually need it and have some people abusing it than to just ignore those who need it.