Not only that, if you go back a three or four generations in your family and find a young woman who gave birth to your great grandfather and a sister out of wedlock and then raised them alone, then you discover that your great grandfather married twice and produced a total of 16 children who grew up to be successful citizens with children of their own, one of whom was your grandfather, then you may realize that if the young, poor, uneducated single woman who gave birth to your great grandfather had been persuaded by "pro-choicers" like those on the streets today to abort that baby, neither you nor all the descendants through those 16 children (probably thousands over time) would have existed.
Good illustration of how a single act can have generational consequences.