About your quibble - that was something that was bothering me a lot until this week's episode. I think this week they made it clear that the "adults" of the Dollhouse are increasingly losing their certainty and sense of control, meaning that they're less likely to notice or care about the dolls' odd behavior.
Boyd doesn't do "nothing" about Echo's sentience - he actually helps her, giving her an access card. And that doesn't surprise me at all. We don't know why Boyd works for the Dollhouse. (In this episode Adelle mentions that all the employees other than Topher were chosen because they are morally compromised, and in Omega, Boyd remarks to Ballard "There's always a girl.") However, it's clear that Boyd is deeply troubled by the Dollhouse's work, and resigned at best to his own involvement in it. Far more powerful than his feelings about the Dollhouse are his feelings for Echo. He wouldn't turn her in, either because he wants her to bring the Dollhouse down, or simply because he couldn't bear for anything bad to happen to her.
As for Adelle - The show has always made it clear that she is charmed by Echo, and treats her differently from other dolls. Maybe she sees herself in Caroline? And the "morally compromised" comment applies to her. The Rossum boss says that Roger is the least of her indiscretions. So we get the sense that she may not have come into the job completely willingly, and she's certainly not free to leave now ("You wouldn't like the retirement package"). And she now knows that Rossum doesn't share the moral code that allows her to justify the Dollhouse. So she's probably feeling very ambivalent about her work right now, and less likely to police the behavior of her charges.
