My own approach to the pro-life argument to try and de-program them is to showcase the Australian kangaroo. The kangaroo gives "birth" after 4 weeks to what would be the equivalent of a human fetus at 6 - 7 weeks in which that tiny little fetus climbs up its mothers body all by itself to climb inside her pouch and attach itself to the mothers nipple where it will continue to grow into a Joey. You can not tell me that a fetus is just a "lump of cells" or a "parasite" when they have such a determination and will to live. The will to live is so intense that this developing fetus has figured out that it needs to climb up its mother and latch onto a nipple in her pouch. Imagine if that was the human gestation cycle for crying out loud. https://www.youtube.com/watch?v=7CAXe1NMQl4 (NSFW - Kangaroo birth)