It isn’t negative or positive, because “would be” people are not real. They are an abstract idea in someone’s head. There are an almost infinite number of would be people. Every time a contraceptive is used, that is a would be person not born. Every time someone does not take the opportunity to have sex, that is a would be person not born. Every single egg not fertilized is a would be person not born. Those “8,000” don’t exist right along with the trillion other would be people, except in the heads of actual living conscious creatures.