That totally confuses me too so I was trying to find some information on it. I also would think it would be much more beneficial to raise the kids in the Sea Org., basically guaranteeing further adult devotees for the future and they were also providing billions of years worth of free child labor, which should more than earn their keep! I found this page with information from a former member about this policy. It is reported that the person in charge of the majority of the Sea Org. members and children did not recommend this policy but that Miscavige ignored the advice and arbitrarily issued the order. He really didn't offer much of an explanation beyond, something along the lines of, children are distracting and hinder efficiency of the Sea Org. What appears to be a copy of the official order and some further background from the former member can be found at this link.
I really felt for Claire in the episode tonight as she clearly felt she had no choice but to terminate her pregnancy and it affects her to this day. As I'm typing this, I thinking the only reasoning for this no children/forced abortion policy is that to a sadistic man, this is the ultimate display of control and a way to further dehumanize and break these people of any free will they might have left.
I found Marc's explanation of the inflation of statistics in the propaganda videos very interesting and it sounds as though these two also had a harrowing escape. I am definitely going to add Headley's book to my reading list to hopefully learn more details. I agree that the statistics in the videos they displayed on this episode sounded completely implausible and they're super cheesy in general.
I would like to think if I were shown this information at an event that I would immediately call BS but I feel like I can't say that for sure because I haven't been systematically indoctrinated over time. I could be wrong but I don't think the people at these big events they discussed last night are newbies or people off the street but rather established Scientologists. I would think that if you've put so much time, effort and money into something, you'd really want to believe that it's for the greater good and not just a bunch of lies, so you'd be much more susceptible to buying into the hype. I think the former members on this show come across very intelligently (including Leah), so my conclusion is that you don't have to necessarily be dumb to be a victim of mind control or propaganda, you just need to be under the right (wrong?) set of circumstances.