The thread does not say that Joseph impregnated Mary.
It says the biblical truth that Joseph had concerns.
All that would be required for a mother to abort a pregancy would be for her to be pregnant. Mary was pregnant.
She chose to love the child.
Mary was certainly not an `unwed mother’. She was found with child by her prospective husband Joseph, who was reassured by G-d in a dream not to fear taking Mary as his wife.
When Mary gave birth to Jesus our Redeemer, she was a wife and now a mother.
Oh, what’s next, that old Jesse Jackson chestnut about Mary and Joseph being a `homeless couple’ while they were in Bethlehem?