Hmm.. So you favour killing a human for no fault of theirs (abortion) but oppose killing as just punishment for an unjustified murder (say the murderer of a child... or a baby)?
Absolutely.
You aren't actually making any argument, which is a little weird, so I'm going to have to guess what your premises would be if you were making an argument.
My first guess is that you believe it's only OK to kill a human if you feel good about it. By "feel good about it" I mean whatever it is when people say that someone "deserves" to die. As near as I can tell the entire meaning of "deserves to die" is "I would feel morally satisfied if this person died". Since moral satisfaction is a good feeling, this amounts to believing it is OK to kill a person if and only if you feel good about it.
I make this guess because you seem to think that "fault" is somehow the sole arbiter of moral killing, and I've noticed that people with primitive, punishment-based social responses tend to regulate their behaviour according to the "fault" they perceive in others, so they feel good about hurting or killing someone who is "at fault" and badly about killing or hurting someone who is not "at fault".
This emotional, unreasoning, non-rational, hormone-driven moral calculus is responsible for a vast amount of evil in the world, from war to hitting your kids, and I am imputing it to you, so please feel free to clarify if I am incorrect in this regard.
Since I reject that emotional, unreasoning, non-rational, hormone-driven moral calculus, I am open to reasons for killing people (or not) that have nothing to do with "fault", and am free to adopt a position that is simply orthogonal to your emotional, hormone-driven categorizations regarding whose death would make you feel good (who "deserves" to die.)
All human societies have some means of killing unwanted children, and I am in favour of giving pregnant women the choice of avoiding bringing unwanted children into the world only to be destroyed in other ways, either through lack of love (they are, after all, unwanted) or more mundane material wants. You are apparently in favour of such unwanted children being born, which seems to me a hideous, anti-human belief, a desire to maximize human misery and pain. Giving mothers the choice to kill their children in the early stages of pregnancy minimizes the human cost of our poor choices, and that's what any humane, rational moralist should be seeking with regard to this question, I think.
Since the child's mother has both the most information about the child's life and prospects and the greatest interest in the child's well-being she should make the decision in this matter, and I think anyone who believes they know more about the reality of the mother and child's situation or claims they are more interested in the child's welfare than its mother is a dangerous moral degenerate.
Since you appear to be not very intelligent I'll mention some obvious consequences of these beliefs: since giving mothers the choice to kill their children late in pregnancy or after they are born would not minimize the human cost of our poor choices there is no slippery slope here. Nor is the precise moment of minimization particularly at issue: any time before 12 weeks is certainly OK, and arguably up to 24 weeks. There is simply no interesting "where do you draw the line" question.
With regard to killing people who have been convicted of some crimes, this is known to increase human misery relative to lifetime incarceration, so I am against it. The wrong people get killed, and all possibility of redemption and rehabilitation is lost even in the cases when the person killed actually committed the act they were accused of.
Likewise, mass organized killing ("war", which I assume you oppose absolutely since most of the people killed are not at fault in any way) is something I oppose because it is the least efficient, least effective means of solving any human problem. It creates vast misery for less than zero gain in the general case. There are always more efficient, more effective, more humane alternatives, so I favour them and oppose war.