[Sherman Logan]

Science explains human nature, and it supports the Catholic Church’s assertion that a new human life begins at conception. No reasonable sane human being can deny this.

True but irrelevant. The issue is not when human life begins, it is when human life should be given the protection of law as a person. That is irreduceably a political question. Science can hopefully provide insight, but it simply cannot answer the question. It's just not a scientific issue.

[MrB]

If we’re “not sure” as Pelosi states, why err on the side of killing a human being?

If a hunter sees movement in the brush, and isn’t sure where his hunting buddy is, can he morally take the shot?