Reason # 1.....
The FBI and the other co-opted and corrupted alphabet agencies cannot be trusted to NOT turn on the American people.
After seeing the likes of Eric Holder and Loretta Lynch, do we really want to give these cretins a backdoor to our private data?
Frankly, July, I would not even trust Ronald Reagan with such a powerful tool. The only way to be certain is to keep it away from EVERY government agency. The temptation to look is just too great. Try going ten minutes without think about the word elephant after someone challenges you not to think the word. If it's there, it WILL be used. That is the problem. There will always be a GOOD reason (read excuse) to use it. The first time makes it easier the second time, and the second time makes it much easier the third, and so on, until it is routine to use it for everything, including jaywalking.