There is not a shortage of adoption worthy homes.
Has not been a shortage for thirty years or more.
Does it really solve an orphans problems to kill her?
So, where are all these adoption worthy people at that critical stage
before the birth of the baby when the mother needs someone to reassure her her baby will be adopted, loved and cared for; and to take care of the prenatal care, including medical care and any psychological care needed for the mother to overcome any dependency problem she might have? They are not there, for the most part. The mother is left to decide, can she handle all this on her own, or is it better if she just ends it, without outside support. These adoption worthy homes you mention only show up after the fact, after the child is born. By then, if the baby had a drug addict mother, or one that was HIV positive, or if the child is sick from poor prenatal care, who wants to adopt it?
That's why I say start as soon as the woman finds out she is pregnant and has to decide. Encourage her, help her get straight if needed, provide the care she needs for a healthy delivery, and if she still doesn't want the baby, have everything arranged for the adoption to become effective as soon after delivery as possible.
And for my part, let the right to lifers who do all the bitching pay every dime - don't raise my taxes for it.