One of the steps that is required for a set up like Hyde to work is the sense of isolation and dependence... Why didn't any of these girls call their mothers? Because the authority of the Hyde community interposes in between parent and child. I learned that first hand at my interview. Every one knew it. "Do not question your doctor," the man said. If the doctor says get naked then get naked.
Someone mentioned some time ago that Hyde was trying to get a two-year commitment from parents at the time... I suppose it is harder to "get" Hyde when you are just there for a year. Notice how none of these instances happened when the girls "just arrived."
See also Gauld's piece
"Isn't Hyde Ever Wrong?" (click for link).
I'm not trying to suggest any nefarious pre-meditation on the part of Hyde School. I am sure that having to deal with the aftermath of the Thurrell and Dubinsky transgressions cost everyone plenty a headache. But I doubt that Thurrell and Dubinsky would have been able to get away with as much as they did, had the kids' self-protective instincts been intact.
When I was there, we were definitely taught that faculty were the next thing closest to God, or Gauld, as it were. Although it seems ludicrous to contemplate at this stage in our lives, back then, it wasn't such a far stretch. If a kid is already very much of a mind to respect authority to begin with, to undergo that extra bit of indoctrination that Hyde heaps on makes for a circumstance quite ripe for exploitation by those with less than noble intent.
(This does not address, of course, Hyde's responsibility to take action once circumstances came to light, but that is for another post...)