Earlier quoted context omitted.
Some of these things are clearly off the deep end. But some of them, especially threats, seem like pretty basic/standard interrogation... There are many techniques, but it seems like we have forgotten it is fundamentally manipulative and abusive. I mean, we are surprised to find that threats are used? What?
It's been shown that torture is among the least effective way of extracting information from unwilling informants. http://www.outsidethebeltway.com/an_fbi_interrogator_on_the_...
It just seems like people are shocked to find fundamentally abusive/manipulative behavior going on at all. Virtually any form of extracting information from an unwilling informant is going to be. Feeding them lies to make them lose hope ("We've captured your co-conspirators") is abusive. Cozying up to them with donuts and backrubs is manipulative. Practically by definition, interrogation on unwilling informants cannot be some friendly, respectful thing.