I do not want someone to drop a baby off at my doorstep
Why don't you want a baby?
I just found out how much I dislike tiny human beings.
You don't have to take the baby in if someone leaves it at your doorstep. You can alert the authorities and they will handle it.
You are right. It is actually not my problem. I do feel better now that  talked to you about it.
Yes, just call the police and they will take it to where it will get care and nourishment. A bay needs to be with people who can take care of it 24/7. No worries for you.