"A fetus cannot survive without it's mother so the mother should have the choice plan and simple."
That is really bizarre reasoning to me. Why would the mother having complete control over the fate of the fetus entitle her to end its life?
Do you apply this logic to other human life in analogous situations? Take your "anyone can take care of that baby" situation... what if no one else will? Suppose for whatever reason no adoption clinic will take the child, and the mother cannot find any other organizations willing to do the same. Does she now get the right to kill the child, just because she is the sole caretaker of the child?
Or take an elderly person who is still of sound mind and mostly of sound body, but has some physical limitation due to age... perhaps they use a dialysis machine because their kidneys no longer function properly, but are otherwise healthy, if old. They can't keep the dialysis machine running on their own power. You are currently that person's caretaker. You live out in the country, out of the reach of the typical living assistance services of cities, and the elderly person has no relatives or other contact with the outside world except for you. If you abandon your current help, this person will die. Do you have the right, not simply to abandon help, but actively terminate the elderly person's life?
I see the concern you have. The uniqueness of pregnancy compared to these scenarios is that in both of the examples I give here, you can easily reject the idea that the caretaker can't kill the person being cared for, without also obliging the caretaker to continue caring for the person. The caretaker could abandon the person being cared for, and while the person being cared for would die as a result, it is difficult to oblige the caretaker to continue caring for the person as a consequence of this, because the moral principles that would create this obligation create an immense and unreasonable burden on the average person to care for any number of dependent people. We might find it distasteful and contrary to our ethical intuition that this caregiver should abandon the person being cared for, but ultimately it is too difficult to create a system whereby the caregiver would be morally culpable that is also functional in everyday life.
In pregnancy, there is no middle ground of "abandonment." You carry a pregnancy to term, or you terminate the fetus. There is no means to "abandon" a pregnancy in this case -- you have to end the budding human life at stake in order to do so.