We should be able to decide abortion is illegal for the same reason we think that murder is illegal. It is a moral issue and if there are no limits on some moral issues then all hell breaks loose. Under the general logic to support abortion for any reason then you wind up down the path of "I should be able to murder people I don't want around me, too."
Will a premature baby survive on its own? No, of course not. But neither would most 3 year olds - should we be allowed to kill a 3 year old if we don't want it? There's all sorts of arguments we could hash out but they've been done before and likely won't change any minds anwyay.
If most abortions were performed because of a medical necessity or because of rape or incest, etc. then I wouldn't have such a problem, but the truth is that most abortions are performed as a "get out of jail free" card by people who don't want to accept responsibility for having sex. Plain and simple. Abortion is used as a cop out. When the bill comes from the tax man they skip out. Guys shouldn't be sleeping around either if they aren't willing to accept being a father. But unless it is a rape then the woman is the gate keeper, so to speak. I will never approve of killing an innocent life just because a person doesn't want to take responsibility for their actions - male or female. Medical necessities are something else entirely in my book. Difficult choices are rarely solved with easy answers.
There are many actions in life that result in potential good or bad consequences, but it seems that abortion is the only time that we get a "do-over". There is something cosmically unfair about that. Drunk drivers don't get do-overs. People having medical proceedures don't get do-overs. And yet a person having sex can get a do-over by just killing the baby and go on with their life like nothing happened if they should desire. It doesn't fit in the grand scheme of things whether you find it religiously or morally reprehensible or not.
So my position is clear, I suppose - and I'm male.