About 2: I think there are certain typical ideological malaises that are a risk for professionalised police and military forces regardless of the specifics of their job. “We are the only bastion against chaos, civvies can only afford to live peacefully because we make the hard calls, they should be more grateful and shut up” etc. Every category can develop an inflated sense of self importance, but of course if your job is to wield a monopoly on violence that’s much more dangerous. In addition, there’s the typical “if all you have is a hammer every problem looks like a nail” issue. But it’s not like community policing would be free from its own malaises, so whichever way one goes, control mechanisms have to be in place. I doubt there’s some inherently stable system not at risk from people getting a little crazy, especially when violence is involved.
About 2: I think there are certain typical ideological malaises that are a risk for professionalised police and military forces regardless of the specifics of their job. “We are the only bastion against chaos, civvies can only afford to live peacefully because we make the hard calls, they should be more grateful and shut up” etc. Every category can develop an inflated sense of self importance, but of course if your job is to wield a monopoly on violence that’s much more dangerous. In addition, there’s the typical “if all you have is a hammer every problem looks like a nail” issue. But it’s not like community policing would be free from its own malaises, so whichever way one goes, control mechanisms have to be in place. I doubt there’s some inherently stable system not at risk from people getting a little crazy, especially when violence is involved.