Somebody with diabetes, low or high blood sugar can also be interpreted as deranged.
There is a more basic underlying problem here.
Our freedom is premised upon respect of legitimate authority.
Even LEOs must respect legitimate authority.
They are given authority by the state to use deadly force where the situation justifies its use.
Those LEOs who rebel from the legitimate authority of the state might simply live by the power of their commission, but if they also commit criminal behavior, are not above the law.
I shrug when I see a comment that 99% of the officers make the other 1% look good. When a teacher misbehaves, one could say that 99% of teachers make the other 1% look good. Or when a truck driver screws up one could say that 99% of truck drivers make the other 1% look good.
I support the efforts of the various agencies to keep their houses in order, and to dismiss officers who are incompetent or dishonest.
If there were a book written each year detailing the accounts of the good and courageous things officers do each calendar year, it would be impossibly huge. I'm sure some of the criticizers of all things police will scoff and say it would be more like a book of the top 10 best moderates in American history, but I know better.