Regarding the BMW example, a great deal of time, emotional investment, and money goes in to making an adult. Infants don't come out of the "factory" ready made like a car. You can't leave an infant in the driveway when you can't afford to "drive" it. A closer analogy is that in the process of building the car, a defect is detected and it is taken off the line before it is finished being built. Lots of car factories closed down during this latest economic downturn, for lack of a market. No demand, don't build cars.
Many times a pregnancy spontaneously aborts or the fetus is re-absorbed before it is too far along development. Something went wonky along the way. You are saying, ravens, that God can abort (an athiest says nature), but people are not allowed to make the same decision.
If we allowed nature (God) to follow it's course in all cases, the Jehovah's Witnesses can allow their children to die for lack of transfusion, cancer patients to die from "natural" causes, and so on. This is not life. This is anti-life.