I'm loathe to post on this thread, given the tenor of it thus far.
However, I will contribute this personal experience of mine (nobody else's): Having lurked very minorly on ESMB for a few years prior to 2010, ESMB and the threads here (which I only grazed) never got my attention like "The Truth Rundown" in the St. Pete Times did.
I had paid little attention to Scientology for many, many years. Was already "out." Therefore, I knew nothing about the horrors of IAS financial extortion, widespread disconnection, physical abuse of Sea Org folks, enforced abortions, that occurred since 1990. Sure, you can say stuff like that went on before -- but I certainly never knew of it. And it seems from everything I've read (and I think I've read 80% now of what's available online) that things got rougher since 1990 or thereabouts.
Anyway, when I read TTR (and I watched all the videos -- all three installments of TTR), the two videos that really got to me the most, by far, were Marty's and Amy's. I believed (and still believe) that what they were saying was true.
In fact, one of the thing that impressed me about Marty's commentary was how uncomfortable he seemed in his own skin about what he was talking about. My interpretation was that he was very conflicted about some of it. He didn't like himself very much, seemed to me. He seemed to me like a man trying to find himself again. And that is part of what made me think he was telling the truth.
Amy, btw, just seemed about the straightest shooter I'd seen in a long time. She was "straight up" about everything. A bottom-line girl if I ever saw one. Loved her.
The others I also believed -- but they, for various reasons, just didn't impress me the way Amy and Marty did.
You could say "on the one hand, on the other hand" about a lot of stuff that's out there. But those videos (again, this is me, talking about me) really were powerful.
Given what I've read posted on Marty's blog by dozens and dozens of people who also read and watched The Truth Rundown videos, they seem to have felt the same way. They mentioned Marty's and Amy's videos (seemed like) more than any others.
I think it's silly to ascribe a single, "silver bullet" reason as "the why" or "the cause" of effects that occur in quite complicated contexts with very long histories. However, there are definitely "tipping points." I think The Truth Rundown (to which many contributed) was a big tipping point for many people. And I think Marty's and Amy's testimonies were the highlights of that collective tipping point.
One woman's opinion. Your mileage may vary.
TG1