<quote><p> The mind-set of most people joining the police and similar (like the FBI) is not compatible with a free society, .</p></quote>
I would beg to differ on this. The mind set of most people joining these agencies is actually a love of country and law and order. But then they get drawn into the task of investigating crimes and continually run into the brick wall of the constitution in their well meaning efforts to root out criminals. That and the continual push from above to arrest the bad guys leads to them trying to make their jobs easier and more effective, thus looking for back-doors or to get them added to crypto software, or other work-arounds to the challenges on collecting information/evidence/intelligence without alerting the suspect(s). These limits and road blocks are good and absolutely necessary to a free society, but that doesn't mean these well meaning officers and agents don't get frustrated and try to seek other ways on occasion.
But that desire comes from a desire to capture and see the guilty punished, yes it can, has and will in the future lead to overstepping bounds (occasionally egregiously), but that does not mean they joined for want of power or control. (Okay some may become police officers for such but not the FBI.)