1) Your morals are not everyones. So you may believe (believe being the operative word, not having facts to back it up) that life does not begin at conception. Others may not have this belief so you cannot force them to believe the way you do.
2) The planet is over crowded as it is. We cannot support the number of people we have today. Facts do not support this but that was and still is the contention.
3) The world would be better off without people. People are the source of all bad things going on, pollution, killing off species and using the natural resources. Of course I nor my liberal friends that believe this will not be the first in line to end our lives but that is irrelevant.
4) Unwanted children will be abused and grow up in poverty and become criminals. So to stop this cycle it is better to end their lives while they are still not sentient. But don't ask me about the death penalty for those that do commit crimes because I want us to go easy on them.
I'm having trouble coming up with any more right now, and they may not be in order. Take my word for it, I believe NONE of these but did in the distant past. Hope that helps, but probably doesn't.
Actually, it does. In fact, the first one is the only one I've ever been able to look at and say that it leads to a consistent world view where you don't also outlaw wanton murder -- you have to genuinely believe that a fetus is not a human being. And that's where I can't go, intellectually, no matter how hard I try.
Here's a tongue-in-cheek Solomon-esk proposal. Taking advantage of (1) above, deliver the baby and then kill the parents! That addresses the population problem, the unwanted child problem, the far-lefters need to destroy something, and the body parts purveyors get more goods. It might even serve as a disincentive to seeking an abortion..... ;->