Earlier quoted context omitted.
3. This is a valuable tool for police, and the police worry about criminal countermeasures once it becomes public. My money is on a combination of 2 & 3.
A tool so valuable that both local police, plus the Federal government, will break numerous laws and trample on the rights of citizens to protect the secret of its existence. An existence so secret that the only people to understand the possibility of its existence is anyone who's been paying attention the last decade. So secret in fact, that the Wikipedia page is only about three years old. I don't care how valuable…
I don't believe that most cops out there actually have an intent to do evil, or to trample your rights though. They deal with criminal after criminal after criminal, I think their perspective is more likely that these tools and methods help solve cases quicker and there-for save taxpayer money and that us civilians aren't able to see that perspective.
I think that they aren't aware of the long term implications of what they're doing and that they should stop, but also that it's important not to think of them as evil if you want to have a dialogue with them about change.