Imagine that you are a contractor responsible for demolishing a building using explosives. Even if you've never watched the Discovery Channel you can imagine the steps. As you prep the building for demolition you erect fences to keep out trespassers. You post Keep Out signs. After the explosives are in place, you do one last sweep of the building to check for vagrants, children, anybody. Then, when you are certain the building is empty of human beings, you detonate. (You probably would hold up detonation in order to remove a stray dog.) As a demolition contractor you would take your responsibility not to kill accidentally very seriously. If someone came running up to you moments before you set off the explosives and told you they thought they had seen someone sneak onto the site, you would postpone the demolition until you were absolutely certain no one was in the building. You would want to know that the building was empty. And the owner of the building certainly would want you to behave responsibly. Our culture, through mores and through the legal system, mandates that we try very hard not to kill someone accidentally.

Think about abortion. The abortionist is the demolition contractor. Does the abortionist know that no human being is killed by abortion? Does the mother (the building owner)? The pro-abortion lobby turns the burden of proof around from where it ought to be. They challenge the anti-abortion side to prove that the fetus is a human being. Wrong. By the logic in the example above of the demoltion contractor, the abortionist must be the one to prove that the fetus is not a human being. The burden of proof is on those who would commit abortions. Prove that you are not killing a human being.