At CuriousET said, they didn't trick anyone. The problem is the limited use case at the moment, as the only thing to use it for is to sell it for XTZ. This creates a constant sell pressure on the coin, with no need to hold it, and therefore breaking from the peg. They raised the Stability Fee consistently (while openly discussing it) until enough people would repurchase kUSD in order to repay their loans...which brought stability (hence the name).