Laws are rigid and don't keep up with the changing times. You might argue that that's the government's fault for not passing new laws, and that's a fair point. However, the judicial has set a precedent over the past 200 years or so of interpreting laws to fit with changing circumstances. Given that's the case, it's hard to blame the FBI for taking advantage of that.

The laws are what the courts interpret them to be; no more and no less. Like it or not, strict interpretation is a fantasy and has been since the late 1700s.