Lack of accountability is the issue. Police always fall back on trying to say their job is so dangerous, and civilians wouldn't understand, but this is just a guilt trip tactic to distract you from persisting with holding police accountable for their negligence or active criminal activity. They have it made right now. In some states you can't even sue the police! They have total immunity. In any line of work, no accountability means there will be problems. When peoples lives are on the line this lack of accountability is unacceptable. Furthermore this lack of accountability has been turned into a for profit industry as police run roughshod over the generally law abiding population to fatten their pension funds, or so they can drive dodge chargers with camouflage vinyls and American flags on it... 

If you think your job is too dangerous and you don't like it FUCKING QUIT, just like the rest of free humanity is forced to do in the same situation. Police ceased being public servants and have become parasitic on the public as an institution, regardless of individual police officers desires to do the right thing (or not). Police are no longer deserving of that same respect, because they no longer occupy the same role. They are now the predators not the protectors, and the conditioning they go through to obfuscate this fact from the individual officers is extensive.