That's what always gets me, that out of the hundreds if not thousands of people who'd need to be involved to pull off a massive event, such as 9/11, not one ever has a change of heart or feels guilty about their participation and talks about it to the media, even anonymously. I mean, there are government whistle blowers in comparatively minor incidents, so why not something as huge as a mass killing? All it'd take is one disgruntled employee to leak some information.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.