In the end of this week's show Leah and Mike were talking about legal action against the church and she said it's not something you enter into lightly. I totally understand what she's saying.
I don't think Scientology has ever, or extremely rarely, lost a court case. They either win or they settle out of court and make the petitioner sign a gag order. Furthermore, fighting an organization as wealthy as Co$ is no small undertaking. Legal fees alone would put anyone into bankruptcy because Co$ has a huge legal team and endless funds. In addition to the financial ruin of taking on this behemoth cult, throughout the case the petitioner is harassed, demoralized, stalked and threatened by their minions.
In short, you're pretty much ruining your life to take them on. I can see why ex-members say they just want to get on with their life. It also explains why Leah and Mike aren't just diving in without preparation. This is a huge undertaking.
On a more positive note, I think social awareness will shut them down faster and Leah and Mike are doing lots of damage to them by doing this show.