They have the same underlying motives as the people on the opposite extreme end trying to push for legalizing killing babies even after a successful birth. Same basic formula of 2 polarized extremes working in tandem to whip everyone up into a frothing frenzy. Based on these types the average NPC thinks most regular citizens either want to kill fully formed healthy babies or want to force children to be reproductive slaves. In REALITY the vast majority of regular citizens are opposed to both such extremes. I have never in my entire life met any regular person who was okay with in any of this extremist crap on either end of the spectrum. Believe it or not most people are actually sane on this particular issue.