A large portion of pregnancies occur unexpectedly and by accident. People can be careless, sometimes people don't protect themselves properly or are uneducated or experienced, sometimes things slip your mind in the heat of the moment... It just happens sometimes. Human beings are prone to mistakes and as a result, very adaptive in nature and in the mind.
But when a mistake is made and a coupleof young lovers or even couples that are just a flick or whatever are forced to go through and have a child for the sake of a moral perspective, regardless of that couple's living conditions, financial stability, physical and mental preparation etc., then abortion is a reasonable and rational option.
Raising a child is serious and will consume at least the next 20 years of your life. It puts a stop to your fun, free, youthful days, puts a permanent strain on your money and resources, takes away some of the mother's looks, and is extremely stressful for even the most prepared couple. Not everyone is ready for such a responsibility, or even sure their partner is the right one yet. In fact, a couple forced to go through with the child due to a subjective, moral obligation are going to be a pretty neglectful mother and father if you know what I mean.
"Well, they should have been more careful."
Like I said above, the human mind is, unfortunately, prone to mistakes. However our specialty as a species is our ability to adapt. Trust me, a couple that have had a "child scare" (no I don't like calling it that but I couldn't think of another term to use) are going to learn the fuck out of that mistake. I also don't like the idea of sex being a "risk" or something. Sex is meant to be a wonderful display of affection that just about everyone desires, its one of our most animalistic urges. Two people should not be obligated to surrender their youthful freedom because they did it wrong.
I'm very aware you have brought up numerous times that you encourage adoption, which is fine with me, but only as another alernative rather than the "right" choice. I'll elaborate on that, but I just wanted to articulate my stance on the broad picture of adoption, as I did above. But a large portion of the Pro-life argument supporters are religious conservatives who would rather one would raise the child anyway regardless, and condemn putting the child up for adoption just as much as abortion. Those are the sort of people my arguments are generally aimed at.
I think adoption is just fine, but - and while I don't think abortion is the "right" choice either, I believe it should be up to the parents - I just don't see it as the morally "better" alternative to abortion or anything along those lines. First of all, child-birth is fucking hard, physically and psychologically, harder than anything men like you and me could imagine, and I say that with sincerity. A lot of women not ready for such a process, one of the factors that plays into why they chose abortion in the first place.
Also, I'd imagine growing up as an orphan would be miserable. Parents, women espectially, factor this in and would rather just stop the life from happening in the first place than have the child and post it up for adoption. Not all parents are comfortable with the fact that, because of them, one more lonely, miserable and un-loved child is out there.
As far as adoption goes, I'm concerned about the child. As for abortion as a whole, however, I'm actually more concerned about the parents, as well as the child but to a much lesser extent. That's where people on different sides of the debate don't see eye to eye.