Because the real problem areas are the core methods and beliefs of the cult that runs these places.
I can't show you hard, properly gathered and peer reviewed data. It just doesn't exist, as far as I know. (and if it does, it's probably classified at the highest level... no kidding)
But if you spend some time reading from and talking with people who have been involved w/ all different TBS, bootcamps, day/foster home structured programs and wilderness programs, you'll find distinct differences, but undeniable comonalities.
It's the commonalities that interest me. They all demand confession w/o anything like evidence; like a kangaroo court. They all strictly limit communication w/ the outside world, among new inductees and even among advanced group members. They all operate on a pyramid marketing scheme more than anything. And they all, that I know of, seem to donate a LOT of money to certain political causes and candidates.
There's more, of course. The after effects are also remarkably similar.
Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded.
--Rep. Robert L. Henry, TX December 22, 1914 (quoting Lincoln)